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[GNUnet-SVN] r3547 - GNUnet/src/util/boot GNUnet/src/util/config_impl GN
|
From: |
grothoff |
|
Subject: |
[GNUnet-SVN] r3547 - GNUnet/src/util/boot GNUnet/src/util/config_impl GNUnet-docs/papers/ecrs gnunet-gtk/src/common gnunet-gtk/src/core gnunet-gtk/src/plugins/daemon gnunet-gtk/src/plugins/fs |
|
Date: |
Mon, 23 Oct 2006 15:25:13 -0700 (PDT) |
Author: grothoff
Date: 2006-10-23 15:24:56 -0700 (Mon, 23 Oct 2006)
New Revision: 3547
Added:
GNUnet-docs/papers/ecrs/techreport.tex
Modified:
GNUnet-docs/papers/ecrs/main.aux
GNUnet-docs/papers/ecrs/main.bbl
GNUnet-docs/papers/ecrs/main.blg
GNUnet-docs/papers/ecrs/main.dvi
GNUnet-docs/papers/ecrs/main.log
GNUnet-docs/papers/ecrs/main.pdf
GNUnet-docs/papers/ecrs/main.ps
GNUnet-docs/papers/ecrs/main.tex
GNUnet-docs/papers/ecrs/ref.bib
GNUnet/src/util/boot/startup.c
GNUnet/src/util/config_impl/impl.c
gnunet-gtk/src/common/helper.c
gnunet-gtk/src/core/main.c
gnunet-gtk/src/plugins/daemon/Makefile.am
gnunet-gtk/src/plugins/fs/Makefile.am
Log:
fixes
Modified: GNUnet/src/util/boot/startup.c
===================================================================
--- GNUnet/src/util/boot/startup.c 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet/src/util/boot/startup.c 2006-10-23 22:24:56 UTC (rev 3547)
@@ -77,7 +77,7 @@
argv);
if (i == -1)
return -1;
- if (OK != GC_parse_configuration(*cfg,
+ if (0 != GC_parse_configuration(*cfg,
*cfgFileName))
return -1;
if (configure_logging(ectx, *cfg) != 0)
Modified: GNUnet/src/util/config_impl/impl.c
===================================================================
--- GNUnet/src/util/config_impl/impl.c 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet/src/util/config_impl/impl.c 2006-10-23 22:24:56 UTC (rev 3547)
@@ -178,17 +178,22 @@
int emptyline;
int ret;
char * section;
+ char * fn;
+ fn = string_expandFileName(NULL,
+ filename);
MUTEX_LOCK(cfg->data->lock);
dirty = cfg->data->dirty; /* back up value! */
- if (NULL == (fp = FOPEN(filename, "r"))) {
+ if (NULL == (fp = FOPEN(fn, "r"))) {
GE_LOG_STRERROR_FILE(cfg->data->ectx,
GE_ERROR | GE_USER | GE_IMMEDIATE | GE_BULK |
GE_REQUEST,
"fopen",
- filename);
+ fn);
MUTEX_UNLOCK(cfg->data->lock);
+ FREE(fn);
return -1;
}
+ FREE(fn);
ret = 0;
section = STRDUP("");
memset(line,
Modified: GNUnet-docs/papers/ecrs/main.aux
===================================================================
--- GNUnet-docs/papers/ecrs/main.aux 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet-docs/papers/ecrs/main.aux 2006-10-23 22:24:56 UTC (rev 3547)
@@ -23,91 +23,66 @@
\citation{ebe2003}
\citation{clark99distributed}
\citation{esed}
-\citation{esed}
-\citation{anderson96eternity,chen99prototype,clark99distributed,freehaven-berk,feamster-infranet,herlihy87how,waldman2001tangler,pub00}
+\citation{anderson96eternity,chen99prototype,clark99distributed,herlihy87how,waldman2001tangler,pub00}
\citation{cohen02replication}
address@hidden {section}{\numberline {2}Related Work}{3}{section.1.2}}
\newlabel{related}{{2}{3}{Related Work\relax }{section.1.2}{}}
\citation{clark99distributed}
+\citation{waldman2001tangler}
address@hidden {subsection}{\numberline {2.1}Freenet}{4}{subsection.1.2.1}}
-\citation{freehaven-berk}
-\citation{rabin89efficient}
-\citation{mojotech}
-\citation{pub00}
\citation{shamir}
address@hidden {subsection}{\numberline {2.2}Free Haven}{5}{subsection.1.2.2}}
address@hidden {subsection}{\numberline {2.3}Mnet and Mojo
Nation}{5}{subsection.1.2.3}}
address@hidden {subsection}{\numberline {2.4}Publius}{5}{subsection.1.2.4}}
-\citation{waldman2001tangler}
-\citation{shamir}
-\citation{cfs:sosp01,mazires00sfs,mazieres02building,muthitacharoen02ivy,rowstron01storage}
+\citation{ecrstechreport}
+\citation{cfs:sosp01,mazieres02building,muthitacharoen02ivy,rowstron01storage}
\citation{cfs:sosp01,rowstron01storage}
\citation{maymounkov02kademlia,stoica01chord}
\citation{mazires00sfs}
\citation{mazieres02building}
address@hidden {subsection}{\numberline {2.5}Tangler}{6}{subsection.1.2.5}}
address@hidden {subsection}{\numberline {2.6}Gnutella and
FastTrack}{6}{subsection.1.2.6}}
address@hidden {subsection}{\numberline {2.2}Tangler}{5}{subsection.1.2.2}}
address@hidden {subsection}{\numberline {2.3}Gnutella and
FastTrack}{5}{subsection.1.2.3}}
address@hidden {subsection}{\numberline {2.4}Distributed File
Systems}{5}{subsection.1.2.4}}
\citation{stratton_oakmont}
\citation{hartman99swarm}
\citation{ebe2003}
address@hidden {subsection}{\numberline {2.7}Distributed File
Systems}{7}{subsection.1.2.7}}
address@hidden {section}{\numberline {3}ECRS encoding}{7}{section.1.3}}
-\newlabel{content}{{3}{7}{ECRS encoding\relax }{section.1.3}{}}
address@hidden {section}{\numberline {3}ECRS encoding}{6}{section.1.3}}
+\newlabel{content}{{3}{6}{ECRS encoding\relax }{section.1.3}{}}
\citation{clark99distributed}
\citation{clark99distributed}
\citation{esed}
\citation{mckusick84fast}
\citation{merkle89tree}
\citation{clark99distributed}
address@hidden {figure}{\numberline {1}{\ignorespaces Simple encoding of a file
using a tree of CHK blocks ($DBlock$s and $IBlock$s are CHK encoded) with one
$KBlock$ to allow for a keyword-based search.}}{9}{figure.1.1}}
-\newlabel{encodingfile}{{1}{9}{ECRS encoding\relax }{figure.1.1}{}}
address@hidden {subsection}{\numberline {3.1}Overview}{9}{subsection.1.3.1}}
address@hidden {subsection}{\numberline {3.2}{\em
DBlocks}}{9}{subsection.1.3.2}}
-\newlabel{dblocks}{{3.2}{9}{{\em DBlocks}\relax }{subsection.1.3.2}{}}
address@hidden {figure}{\numberline {1}{\ignorespaces Simple encoding of a file
using a tree of CHK blocks ($DBlock$s and $IBlock$s are CHK encoded) with one
$KBlock$ to allow for a keyword-based search.}}{8}{figure.1.1}}
+\newlabel{encodingfile}{{1}{8}{ECRS encoding\relax }{figure.1.1}{}}
address@hidden {subsection}{\numberline {3.1}Overview}{8}{subsection.1.3.1}}
address@hidden {subsection}{\numberline {3.2}{\em
DBlocks}}{8}{subsection.1.3.2}}
+\newlabel{dblocks}{{3.2}{8}{{\em DBlocks}\relax }{subsection.1.3.2}{}}
\citation{secure2004goh}
address@hidden {subsection}{\numberline {3.3}{\em
IBlocks}}{10}{subsection.1.3.3}}
-\newlabel{iblocks}{{3.3}{10}{{\em IBlocks}\relax }{subsection.1.3.3}{}}
address@hidden {subsection}{\numberline {3.4}Finding
files}{10}{subsection.1.3.4}}
-\newlabel{sec:search}{{3.4}{10}{Finding files\relax }{subsection.1.3.4}{}}
-\citation{clark99distributed}
address@hidden {subsection}{\numberline {3.5}Namespaces}{11}{subsection.1.3.5}}
-\newlabel{sblock}{{3.5}{11}{Namespaces\relax }{subsection.1.3.5}{}}
address@hidden {subsection}{\numberline {3.6}Keyword
search}{12}{subsection.1.3.6}}
-\newlabel{kblocks}{{3.6}{12}{Keyword search\relax }{subsection.1.3.6}{}}
address@hidden {figure}{\numberline {2}{\ignorespaces The construction of a
{\em KBlock}. The hash $H(K)$ of the keyword $K$ is used to encrypt the data
and to seed the key generator. The obtained private key $Prv_{H(K)}$ signs the
encrypted data, but is not otherwise used. Finally, the public key $Pub_{H(K)}$
is appended to the signed data to form the {\em KBlock}.}}{13}{figure.1.2}}
-\newlabel{kblockdiagram}{{2}{13}{Keyword search\relax }{figure.1.2}{}}
-\newlabel{split}{{2}{14}{Summary\relax }{Item.2}{}}
-\newlabel{encryptStep}{{3}{14}{Summary\relax }{Item.3}{}}
address@hidden {figure}{\numberline {3}{\ignorespaces The ECRS encoding
algorithm.}}{14}{figure.1.3}}
-\newlabel{ECRS}{{3}{14}{Summary\relax }{figure.1.3}{}}
address@hidden {subsection}{\numberline {3.7}Summary}{14}{subsection.1.3.7}}
address@hidden {section}{\numberline {4}Extensions}{14}{section.1.4}}
-\newlabel{extensions}{{4}{14}{Extensions\relax }{section.1.4}{}}
-\citation{le2005}
address@hidden {figure}{\numberline {4}{\ignorespaces Example protocol for an
ECRS download. $(Q_i,K_i)$ is a CHK pair to request and decrypt block
$i$.}}{15}{figure.1.4}}
-\newlabel{protocol}{{4}{15}{Summary\relax }{figure.1.4}{}}
address@hidden {subsection}{\numberline {4.1}Keyword
inference}{15}{subsection.1.4.1}}
-\newlabel{keywords}{{4.1}{15}{Keyword inference\relax }{subsection.1.4.1}{}}
address@hidden {subsection}{\numberline {4.2}Directories}{15}{subsection.1.4.2}}
-\citation{bloom}
address@hidden {figure}{\numberline {5}{\ignorespaces ECRS allows the
formation of complicated network structures. In this example, the {\em SBlock}
of pseudonym \relax $\@@underline {\hbox {\it {Alice}}}\mathsurround \z@
$\relax eventually allows to retrieve two of the documents encoded in the
system, as does {\em Kblock} for keyword ``food". Boxes denote simple blocks
that serve as entry-points. The directory and the documents consist of trees of
possibly many CHK-encoded blocks. Searching for keyword ``soda" would return
two results pointing to different resources. Note that all the encoded
resources, including the one document with no pointers to it, can be retrieved
by knowing the CHK keys of their root {\em IBlock}s. }}{16}{figure.1.5}}
-\newlabel{fig:network}{{5}{16}{Directories\relax }{figure.1.5}{}}
address@hidden {subsection}{\numberline {4.3}Efficient lookups with bloom
filters}{16}{subsection.1.4.3}}
address@hidden {subsection}{\numberline {3.3}{\em
IBlocks}}{9}{subsection.1.3.3}}
+\newlabel{iblocks}{{3.3}{9}{{\em IBlocks}\relax }{subsection.1.3.3}{}}
address@hidden {subsection}{\numberline {3.4}Finding
files}{9}{subsection.1.3.4}}
+\newlabel{sec:search}{{3.4}{9}{Finding files\relax }{subsection.1.3.4}{}}
address@hidden {figure}{\numberline {2}{\ignorespaces The construction of a
{\em KBlock}. The hash $H(K)$ of the keyword $K$ is used to encrypt the data
and to seed the key generator. The obtained private key $Prv_{H(K)}$ signs the
encrypted data, but is not otherwise used. Finally, the public key $Pub_{H(K)}$
is appended to the signed data to form the {\em KBlock}.}}{11}{figure.1.2}}
+\newlabel{kblockdiagram}{{2}{11}{Finding files\relax }{figure.1.2}{}}
+\newlabel{split}{{2}{11}{Summary\relax }{Item.2}{}}
+\newlabel{encryptStep}{{3}{11}{Summary\relax }{Item.3}{}}
address@hidden {figure}{\numberline {3}{\ignorespaces The ECRS encoding
algorithm.}}{11}{figure.1.3}}
+\newlabel{ECRS}{{3}{11}{Summary\relax }{figure.1.3}{}}
address@hidden {subsection}{\numberline {3.5}Summary}{11}{subsection.1.3.5}}
\citation{freehaven-berk,mojotech}
\citation{rabin89efficient}
address@hidden {section}{\numberline {5}Discussion}{17}{section.1.5}}
-\newlabel{discussion}{{5}{17}{Discussion\relax }{section.1.5}{}}
address@hidden {subsection}{\numberline {5.1}Attacks}{17}{subsection.1.5.1}}
address@hidden {figure}{\numberline {4}{\ignorespaces Example protocol for an
ECRS download. $(Q_i,K_i)$ is a CHK pair to request and decrypt block
$i$.}}{12}{figure.1.4}}
+\newlabel{protocol}{{4}{12}{Summary\relax }{figure.1.4}{}}
address@hidden {section}{\numberline {4}Discussion}{12}{section.1.4}}
+\newlabel{discussion}{{4}{12}{Discussion\relax }{section.1.4}{}}
+\citation{ecrstechreport}
\citation{levien03advogato}
-\citation{esed}
address@hidden {subsection}{\numberline {5.2}{\em KBlocks} or
triple-hash}{18}{subsection.1.5.2}}
address@hidden {section}{\numberline {6}Conclusion}{19}{section.1.6}}
-\newlabel{conclusion}{{6}{19}{Conclusion\relax }{section.1.6}{}}
address@hidden {section}{\numberline {5}Conclusion}{13}{section.1.5}}
+\newlabel{conclusion}{{5}{13}{Conclusion\relax }{section.1.5}{}}
\bibstyle{plain}
\bibdata{ref}
\bibcite{anderson96eternity}{1}
-\bibcite{esed}{2}
-\bibcite{bloom}{3}
+\bibcite{ecrstechreport}{2}
+\bibcite{esed}{3}
\bibcite{chen99prototype}{4}
\bibcite{clark99distributed}{5}
\bibcite{cohen02replication}{6}
@@ -115,26 +90,24 @@
\bibcite{dingledine02mixminion}{8}
\bibcite{freehaven-berk}{9}
\bibcite{farsite}{10}
-\bibcite{feamster-infranet}{11}
-\bibcite{secure2004goh}{12}
-\bibcite{ebe2003}{13}
-\bibcite{le2005}{14}
-\bibcite{hartman99swarm}{15}
-\bibcite{herlihy87how}{16}
-\bibcite{levien03advogato}{17}
-\bibcite{maymounkov02kademlia}{18}
-\bibcite{mazires00sfs}{19}
-\bibcite{mazieres02building}{20}
-\bibcite{mckusick84fast}{21}
-\bibcite{merkle89tree}{22}
-\bibcite{muthitacharoen02ivy}{23}
-\bibcite{perng2005csr}{24}
-\bibcite{rabin89efficient}{25}
-\bibcite{rowstron01storage}{26}
-\bibcite{shamir}{27}
-\bibcite{stoica01chord}{28}
-\bibcite{stratton_oakmont}{29}
-\bibcite{syverson97anonymous}{30}
-\bibcite{waldman2001tangler}{31}
-\bibcite{pub00}{32}
-\bibcite{mojotech}{33}
+\bibcite{secure2004goh}{11}
+\bibcite{ebe2003}{12}
+\bibcite{hartman99swarm}{13}
+\bibcite{herlihy87how}{14}
+\bibcite{levien03advogato}{15}
+\bibcite{maymounkov02kademlia}{16}
+\bibcite{mazires00sfs}{17}
+\bibcite{mazieres02building}{18}
+\bibcite{mckusick84fast}{19}
+\bibcite{merkle89tree}{20}
+\bibcite{muthitacharoen02ivy}{21}
+\bibcite{perng2005csr}{22}
+\bibcite{rabin89efficient}{23}
+\bibcite{rowstron01storage}{24}
+\bibcite{shamir}{25}
+\bibcite{stoica01chord}{26}
+\bibcite{stratton_oakmont}{27}
+\bibcite{syverson97anonymous}{28}
+\bibcite{waldman2001tangler}{29}
+\bibcite{pub00}{30}
+\bibcite{mojotech}{31}
Modified: GNUnet-docs/papers/ecrs/main.bbl
===================================================================
--- GNUnet-docs/papers/ecrs/main.bbl 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet-docs/papers/ecrs/main.bbl 2006-10-23 22:24:56 UTC (rev 3547)
@@ -5,17 +5,18 @@
\newblock {The Eternity Service}.
\newblock In {\em Proceedings of Pragocrypt 1996}, 1996.
+\bibitem{ecrstechreport}
+Krista Bennett, Christian Grothoff, Tzvetan Horozov, and J.~T. Lindgren.
+\newblock {An Encoding for Censorship-Resistant Sharing}.
+\newblock Technical report, 2003.
+\newblock available at http://gnunet.org/download/ecrs.ps.
+
\bibitem{esed}
Krista Bennett, Christian Grothoff, Tzvetan Horozov, and Ioana Patrascu.
\newblock {Efficient Sharing of Encrypted Data}.
\newblock In {\em {ASCIP}}, volume 2384 of {\em Lecture Notes in Computer
Science}, pages 107--120. Springer-Verlag Inc., 2002.
-\bibitem{bloom}
-Burton Bloom.
-\newblock Space/time trade-offs in hash coding with allowable errors.
-\newblock {\em Communications of the ACM}, 13(7):422--426, 1970.
-
\bibitem{chen99prototype}
Yuan Chen, Jan Edler, Andrew Goldberg, Allan Gottlieb, Sumeet Sobti, and Peter
Yianilos.
@@ -63,12 +64,6 @@
file system.
\newblock Technical report, Microsoft Research, 2002.
-\bibitem{feamster-infranet}
-Nick Feamster, Magdalena Balazinska, Greg Harfst, Hari Balakrishnan, and David
- Karger.
-\newblock Infranet: Circumventing web censorship and surveillance.
-\newblock In {\em {11th USENIX Security Symposium}}, 2002.
-
\bibitem{secure2004goh}
Eu-Jin Goh.
\newblock Secure indexes.
@@ -80,11 +75,6 @@
Peer-to-Peer Networks}.
\newblock {\em Wirtschaftsinformatik}, 3-2003, June 2003.
-\bibitem{le2005}
-Christian Grothoff.
-\newblock {Reading File Metadata with extract and libextractor}.
-\newblock {\em LinuxJournal}, 6-2005, June 2005.
-
\bibitem{hartman99swarm}
John~H. Hartman, Ian Murdock, and Tammo Spalink.
\newblock The swarm scalable storage system.
Modified: GNUnet-docs/papers/ecrs/main.blg
===================================================================
--- GNUnet-docs/papers/ecrs/main.blg 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet-docs/papers/ecrs/main.blg 2006-10-23 22:24:56 UTC (rev 3547)
@@ -2,44 +2,46 @@
The top-level auxiliary file: main.aux
The style file: plain.bst
Database file #1: ref.bib
-You've used 33 entries,
+Warning--empty institution in ecrstechreport
+You've used 31 entries,
2118 wiz_defined-function locations,
- 682 strings with 9615 characters,
-and the built_in function-call counts, 11647 in all, are:
-= -- 1111
-> -- 519
+ 669 strings with 9418 characters,
+and the built_in function-call counts, 11079 in all, are:
+= -- 1058
+> -- 500
< -- 15
-+ -- 209
-- -- 171
-* -- 722
-:= -- 1852
-add.period$ -- 105
-call.type$ -- 33
-change.case$ -- 182
++ -- 201
+- -- 165
+* -- 685
+:= -- 1759
+add.period$ -- 100
+call.type$ -- 31
+change.case$ -- 174
chr.to.int$ -- 0
-cite$ -- 33
-duplicate$ -- 523
-empty$ -- 998
-format.name$ -- 171
-if$ -- 2553
+cite$ -- 32
+duplicate$ -- 496
+empty$ -- 941
+format.name$ -- 165
+if$ -- 2433
int.to.chr$ -- 0
-int.to.str$ -- 33
-missing$ -- 29
-newline$ -- 167
-num.names$ -- 72
-pop$ -- 247
+int.to.str$ -- 31
+missing$ -- 26
+newline$ -- 158
+num.names$ -- 68
+pop$ -- 237
preamble$ -- 1
-purify$ -- 150
+purify$ -- 143
quote$ -- 0
-skip$ -- 372
+skip$ -- 355
stack$ -- 0
-substring$ -- 573
-swap$ -- 160
+substring$ -- 538
+swap$ -- 156
text.length$ -- 15
text.prefix$ -- 0
top$ -- 0
-type$ -- 132
-warning$ -- 0
-while$ -- 103
-width$ -- 35
-write$ -- 361
+type$ -- 124
+warning$ -- 1
+while$ -- 97
+width$ -- 33
+write$ -- 341
+(There was 1 warning)
Modified: GNUnet-docs/papers/ecrs/main.dvi
===================================================================
(Binary files differ)
Modified: GNUnet-docs/papers/ecrs/main.log
===================================================================
--- GNUnet-docs/papers/ecrs/main.log 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet-docs/papers/ecrs/main.log 2006-10-23 22:24:56 UTC (rev 3547)
@@ -1,4 +1,4 @@
-This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4) (format=pdflatex
2006.9.14) 26 SEP 2006 15:20
+This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4) (format=pdflatex
2006.10.11) 23 OCT 2006 15:35
entering extended mode
**main.tex
(./main.tex
@@ -11,9 +11,9 @@
(./llncs.cls
Document Class: llncs 2001/08/14 v2.10
experimental LaTeX document class for Lecture Notes in Computer Science
-(/usr/share/texmf-tetex/tex/latex/base/article.cls
+(/usr/share/texmf/tex/latex/base/article.cls
Document Class: article 2004/02/16 v1.4f Standard LaTeX document class
-(/usr/share/texmf-tetex/tex/latex/base/size10.clo
+(/usr/share/texmf/tex/latex/base/size10.clo
File: size10.clo 2004/02/16 v1.4f Standard LaTeX file (size option)
)
address@hidden
@@ -28,7 +28,7 @@
\belowcaptionskip=\skip42
\bibindent=\dimen102
)
-(/usr/share/texmf-tetex/tex/latex/tools/multicol.sty
+(/usr/share/texmf/tex/latex/tools/multicol.sty
Package: multicol 2004/02/14 v1.6e multicolumn formatting (FMi)
address@hidden
address@hidden
@@ -126,30 +126,30 @@
address@hidden
\headlineindent=\dimen123
)
-(/usr/share/texmf-tetex/tex/latex/base/inputenc.sty
+(/usr/share/texmf/tex/latex/base/inputenc.sty
Package: inputenc 2004/02/05 v1.0d Input encoding file
-(/usr/share/texmf-tetex/tex/latex/base/ansinew.def
+(/usr/share/texmf/tex/latex/base/ansinew.def
File: ansinew.def 2004/02/05 v1.0d Input encoding file
))
-(/usr/share/texmf-tetex/tex/latex/amsmath/amsmath.sty
+(/usr/share/texmf/tex/latex/amsmath/amsmath.sty
Package: amsmath 2000/07/18 v2.13 AMS math features
address@hidden
For additional information on amsmath, use the `?' option.
-(/usr/share/texmf-tetex/tex/latex/amsmath/amstext.sty
+(/usr/share/texmf/tex/latex/amsmath/amstext.sty
Package: amstext 2000/06/29 v2.01
-(/usr/share/texmf-tetex/tex/latex/amsmath/amsgen.sty
+(/usr/share/texmf/tex/latex/amsmath/amsgen.sty
File: amsgen.sty 1999/11/30 v2.0
address@hidden
address@hidden
))
-(/usr/share/texmf-tetex/tex/latex/amsmath/amsbsy.sty
+(/usr/share/texmf/tex/latex/amsmath/amsbsy.sty
Package: amsbsy 1999/11/29 v1.2d
address@hidden
)
-(/usr/share/texmf-tetex/tex/latex/amsmath/amsopn.sty
+(/usr/share/texmf/tex/latex/amsmath/amsopn.sty
Package: amsopn 1999/12/14 v2.01 operator names
)
address@hidden
@@ -193,17 +193,17 @@
address@hidden
LaTeX Info: Redefining \[ on input line 2666.
LaTeX Info: Redefining \] on input line 2667.
-) (/usr/share/texmf-tetex/tex/latex/amsfonts/amssymb.sty
+) (/usr/share/texmf/tex/latex/amsfonts/amssymb.sty
Package: amssymb 2002/01/22 v2.2d
-(/usr/share/texmf-tetex/tex/latex/amsfonts/amsfonts.sty
+(/usr/share/texmf/tex/latex/amsfonts/amsfonts.sty
Package: amsfonts 2001/10/25 v2.2f
\symAMSa=\mathgroup4
\symAMSb=\mathgroup5
LaTeX Font Info: Overwriting math alphabet `\mathfrak' in version `bold'
(Font) U/euf/m/n --> U/euf/b/n on input line 132.
))
-(/usr/share/texmf-tetex/tex/latex/base/exscale.sty
+(/usr/share/texmf/tex/latex/base/exscale.sty
Package: exscale 1997/06/16 v2.1g Standard LaTeX package exscale
LaTeX Font Info: Redeclaring symbol font `largesymbols' on input line 52.
LaTeX Font Info: Overwriting symbol font `largesymbols' in version `normal'
@@ -212,28 +212,28 @@
(Font) OMX/cmex/m/n --> OMX/cmex/m/n on input line 52.
address@hidden
)
-(/usr/share/texmf-tetex/tex/latex/graphics/epsfig.sty
+(/usr/share/texmf/tex/latex/graphics/epsfig.sty
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LaTeX Info: Redefining \pageref on input line 19.
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@@ -1108,7 +842,6 @@
dup 66 /B put
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dup 73 /I put
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dup 99 /c put
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@@ -1672,14 +1389,9 @@
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dup 51 /d51 put
dup 54 /d54 put
-dup 79 /d79 put
-dup 111 /d111 put
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dup 114 /d114 put
-dup 116 /d116 put
dup 117 /d117 put
dup 121 /d121 put
readonly def
@@ -1708,66 +1420,51 @@
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0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
@@ -1831,13 +1528,8 @@
dup 43 /d43 put
dup 44 /d44 put
dup 47 /d47 put
-dup 49 /d49 put
dup 54 /d54 put
-dup 79 /d79 put
-dup 111 /d111 put
-dup 112 /d112 put
dup 114 /d114 put
-dup 116 /d116 put
dup 117 /d117 put
dup 121 /d121 put
readonly def
@@ -1866,65 +1558,51 @@
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@@ -1974,12 +1652,10 @@
dup 99 /c put
dup 100 /d put
dup 101 /e put
-dup 102 /f put
dup 103 /g put
dup 105 /i put
dup 107 /k put
dup 108 /l put
-dup 109 /m put
dup 110 /n put
dup 111 /o put
dup 112 /p put
@@ -2017,235 +1693,218 @@
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@@ -2336,7 +1995,6 @@
dup 117 /u put
dup 118 /v put
dup 119 /w put
-dup 120 /x put
dup 121 /y put
dup 123 /endash put
dup 124 /emdash put
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@@ -2794,27 +2445,17 @@
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 12 /fi put
-dup 14 /ffi put
-dup 45 /hyphen put
dup 46 /period put
dup 49 /one put
dup 50 /two put
dup 51 /three put
dup 52 /four put
dup 53 /five put
-dup 54 /six put
-dup 55 /seven put
dup 65 /A put
dup 68 /D put
-dup 69 /E put
dup 70 /F put
dup 71 /G put
-dup 72 /H put
-dup 75 /K put
-dup 77 /M put
-dup 78 /N put
dup 79 /O put
-dup 80 /P put
dup 83 /S put
dup 84 /T put
dup 97 /a put
@@ -2822,17 +2463,13 @@
dup 99 /c put
dup 100 /d put
dup 101 /e put
-dup 102 /f put
dup 103 /g put
-dup 104 /h put
dup 105 /i put
-dup 106 /j put
dup 107 /k put
dup 108 /l put
dup 109 /m put
dup 110 /n put
dup 111 /o put
-dup 112 /p put
dup 114 /r put
dup 115 /s put
dup 116 /t put
@@ -2870,279 +2507,202 @@
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0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
@@ -3176,7 +2736,6 @@
dup 58 /period put
dup 59 /comma put
dup 66 /B put
-dup 67 /C put
dup 68 /D put
dup 69 /E put
dup 72 /H put
@@ -3185,21 +2744,16 @@
dup 79 /O put
dup 80 /P put
dup 81 /Q put
-dup 82 /R put
-dup 88 /X put
dup 98 /b put
dup 99 /c put
-dup 101 /e put
dup 105 /i put
dup 107 /k put
dup 108 /l put
dup 110 /n put
dup 111 /o put
dup 114 /r put
-dup 115 /s put
dup 117 /u put
dup 118 /v put
-dup 122 /z put
readonly def
/FontBBox{-32 -250 1048 750}readonly def
currentdict end
@@ -3224,187 +2778,143 @@
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@@ -3437,12 +2947,10 @@
0 1 255 {1 index exch /.notdef put} for
dup 12 /fi put
dup 45 /hyphen put
-dup 65 /A put
dup 66 /B put
dup 68 /D put
dup 73 /I put
dup 75 /K put
-dup 82 /R put
dup 83 /S put
dup 97 /a put
dup 98 /b put
@@ -3459,7 +2967,6 @@
dup 110 /n put
dup 111 /o put
dup 112 /p put
-dup 113 /q put
dup 114 /r put
dup 115 /s put
dup 116 /t put
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0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
@@ -3759,7 +3245,6 @@
dup 51 /three put
dup 52 /four put
dup 53 /five put
-dup 54 /six put
dup 65 /A put
dup 67 /C put
dup 68 /D put
@@ -3785,7 +3270,6 @@
dup 115 /s put
dup 116 /t put
dup 117 /u put
-dup 120 /x put
readonly def
/FontBBox{-53 -251 1139 750}readonly def
currentdict end
@@ -3816,165 +3300,154 @@
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0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
@@ -5035,7 +4508,6 @@
dup 50 /two put
dup 51 /three put
dup 52 /four put
-dup 53 /five put
readonly def
/FontBBox{-27 -250 1122 750}readonly def
currentdict end
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@@ -5163,7 +4629,6 @@
dup 58 /colon put
dup 59 /semicolon put
dup 61 /equal put
-dup 63 /question put
dup 65 /A put
dup 66 /B put
dup 67 /C put
@@ -5180,7 +4645,6 @@
dup 78 /N put
dup 79 /O put
dup 80 /P put
-dup 81 /Q put
dup 82 /R put
dup 83 /S put
dup 84 /T put
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@@ -5829,22 +5275,22 @@
SDict begin [ /View [/XYZ H.V] /Dest (chapter.1) cvn H.B /DEST pdfmark
end
523 365 a Black Black 586 448 a
-FB(An)45 b(Enco)t(ding)f(for)h(Censorship-Resistan)l(t)i(Sharing)566
-740 y FA(Christian)27 b(Grotho\013)1239 710 y Fz(1)1276
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-740 y FA(,)g(Tzv)n(etan)g(Horozo)n(v)2599 710 y Fz(3)2634
-740 y FA(,)h(Jussi)f(T.)h(Lindgren)3326 710 y Fz(4)894
-882 y Fy(1)967 914 y Fx(Departmen)n(t)d(of)i(Computer)f(Science,)g
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+740 y Fx(,)g(Tzv)n(etan)g(Horozo)n(v)2599 710 y Fw(3)2634
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(Univ)n(ersit)n(y)e(of)j(Den)n(v)n(er,)e(USA)1532 1005
-y Fw(address@hidden)606 1065 y Fy(2)679 1096
-y Fx(CERIAS)g(/)h(In)n(terdepartmen)n(tal)f(Program)i(in)f
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(Linguistics,)h(Purdue)e(Univ)n(ersit)n(y)-6 b(,)25 b(USA)1591
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(Univ)n(ersit)n(y)f(of)i(Helsinki,)f(Finland)1513 1553
-y Fw(address@hidden)p Black 759 1916 a Fv(Abstract.)p
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(t)e(enco)r(ding)i(sc)n(heme)f(for)759 2007 y(censorship-resistan)n(t)
18 b(p)r(eer-to-p)r(eer)f(net)n(w)n(orking.)h(The)f(prop)r(osed)h(enco)
r(ding)f(mec)n(h-)759 2098 y(anism)36 b(supp)r(orts)e(b)r(oth)h
@@ -5871,8 +5317,8 @@
3095 a 523 3095 a
SDict begin [ /View [/XYZ H.V] /Dest (section.1.1) cvn H.B /DEST pdfmark
end
- 523 3095 a 119 x Fu(1)112 b(In)m(tro)s(duction)523
-3427 y FA(In)n(ternet)40 b(censorship)f(is)i(a)f(p)r(o)n(w)n(erful)f(w)
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n(eap)r(on)h(for)g(oppressiv)n(e)e(go)n(v)n(ernmen)n(ts,)g(corp)r(o-)
523 3527 y(rations)g(and)h(pressure)f(groups)g(in)i(sti\015ing)f
(dissen)n(t)g(and)g(suppressing)f(dissemination)523 3626
@@ -5885,14 +5331,14 @@
3925 y(tec)n(hnical)25 b(measures,)f(individuals)h(can)f(b)r(e)i
(singled)e(out)h(and)g(sub)5 b(jected)26 b(to)f(harassmen)n(t.)523
4025 y(A)h(common)e(requiremen)n(t)h(for)g(censorship)f(in)h(an)n(y)g
-(form)g(is)g(the)h(abilit)n(y)f(to)g Ft(r)l(e)l(c)l(o)l(gnize)h
-FA(the)523 4125 y(ob)5 b(jectionable)27 b(information.)648
+(form)g(is)g(the)h(abilit)n(y)f(to)g Fq(r)l(e)l(c)l(o)l(gnize)h
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4227 y(The)21 b(goal)g(of)g(the)h(enco)r(ding)f(sc)n(heme)g(presen)n
(ted)g(in)h(this)g(pap)r(er)f(is)h(to)f(mak)n(e)g(it)h(di\016cult)523
4327 y(to)31 b(iden)n(tify)g(information)f(stored)g(or)f(transmitted)i
-(in)g(a)f(op)r(en)h Ft(de)l(c)l(entr)l(alize)l(d)h FA(wide-area)523
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(enco)r(ding)523 4526 y(sc)n(heme,)36 b(called)g(ECRS,)g(allo)n(ws)f(b)
r(oth)i(con)n(ten)n(t)f(and)g(queries)g(to)g(b)r(e)h(encrypted)f(while)
523 4625 y(b)r(eing)g(transmitted)g(or)g(stored)f(on)h(the)g(net)n(w)n
@@ -5901,7 +5347,7 @@
(handling,)h(reducing)g(the)h(c)n(hance)e(that)i(they)523
4825 y(can)d(b)r(e)g(singled)g(out)g(for)f(an)h(attac)n(k)f(or)g(held)i
(liable.)e(It)i(is)f(imp)r(ortan)n(t)f(to)h(note)g(that)h(the)523
-4924 y(primary)19 b(goal)f(is)h Ft(deniability)k FA(for)c(the)h(p)r
+4924 y(primary)19 b(goal)f(is)h Fq(deniability)k Fx(for)c(the)h(p)r
(eers)f(storing)g(and)g(transmitting)h(the)g(information.)p
Black Black eop end
%%Page: 2 2
@@ -5919,11 +5365,11 @@
523 232 a 523 232 a
SDict begin [ /View [/XYZ H.V] /Dest (page.2) cvn H.B /DEST pdfmark
end
- 523 232 a Black Fx(2)237 b(C.)27
+ 523 232 a Black Fu(2)237 b(C.)27
b(Grotho\013,)f(K.)g(Grotho\013,)g(T.)h(Horozo)n(v,)f(J.T.)h(Lindgren)p
-Black 523 448 a FA(These)h(p)r(eers)f(m)n(ust)i(b)r(e)f(able)g(to)g
+Black 523 448 a Fx(These)h(p)r(eers)f(m)n(ust)i(b)r(e)f(able)g(to)g
(claim)g(that)g(decrypting)f(the)i(information)e(is)h(infeasible)523
-548 y Ft(for)j(them)p FA(.)648 678 y(W)-7 b(e)23 b(\014nd)g(it)f
+548 y Fq(for)j(them)p Fx(.)648 678 y(W)-7 b(e)23 b(\014nd)g(it)f
(acceptable)g(if)h(a)g(censor)e(who)h(kno)n(ws)g(precisely)f(whic)n(h)i
(con)n(ten)n(t)f(to)g(censor)523 778 y(is)28 b(able)f(to)g(matc)n(h)h
(a)f(request)g(or)f(resp)r(onse)h(against)f(that)i(particular)f(con)n
@@ -5937,23 +5383,23 @@
(as)g(anon)n(ymous)e(routing)i([)p 0 1 0 TeXcolorrgb
3002 1177 a
SDict begin H.S end
- 3002 1177 a 0 1 0 TeXcolorrgb FA(8)p 0 1 0
+ 3002 1177 a 0 1 0 TeXcolorrgb Fx(8)p 0 1 0
TeXcolorrgb 3043 1123 a
SDict begin H.R end
3043 1123 a 3043 1177 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.dingledine02mixminion) cvn H.B /ANN pdfmark end
3043
-1177 a Black FA(,)p 0 1 0 TeXcolorrgb 3066 1177 a
+1177 a Black Fx(,)p 0 1 0 TeXcolorrgb 3066 1177 a
SDict begin H.S end
3066
-1177 a 0 1 0 TeXcolorrgb FA(30)p 0 1 0 TeXcolorrgb 3150
+1177 a 0 1 0 TeXcolorrgb Fx(28)p 0 1 0 TeXcolorrgb 3150
1123 a
SDict begin H.R end
3150 1123 a 3150 1177 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.syverson97anonymous) cvn H.B /ANN pdfmark end
- 3150 1177 a Black FA(].)g(As)g(a)523
+ 3150 1177 a Black Fx(].)g(As)g(a)523
1276 y(con)n(ten)n(t)23 b(enco)r(ding)h(mec)n(hanism,)f(ECRS)g(could)h
(b)r(e)g(in)n(tegrated)f(in)n(to)g(almost)g(an)n(y)g(generic)523
1376 y(p)r(eer-to-p)r(eer)30 b(infrastructure)h(to)h(enhance)f(its)h
@@ -5966,13 +5412,13 @@
0 1 0 TeXcolorrgb 1520 1805 a
SDict begin H.S end
1520 1805 a 0 1 0 TeXcolorrgb
-FA(24)p 0 1 0 TeXcolorrgb 1603 1752 a
+Fx(22)p 0 1 0 TeXcolorrgb 1603 1752 a
SDict begin H.R end
1603 1752 a 1603
1805 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.perng2005csr) cvn H.B /ANN pdfmark end
- 1603 1805 a Black FA(],)h(in)g(whic)n(h)g(censorship)e
+ 1603 1805 a Black Fx(],)h(in)g(whic)n(h)g(censorship)e
(resistance)h(is)h(de\014ned)g(as)f(the)523 1905 y(inabilit)n(y)41
b(of)f(a)h(censor)e(to)i(restrict)f(a)h(targeted)e(do)r(cumen)n(t)i
(while)g(allo)n(wing)f(at)g(least)523 2004 y(one)f(other)g(do)r(cumen)n
@@ -5980,13 +5426,13 @@
0 1 0 TeXcolorrgb 2637 2004 a
SDict begin H.S end
2637 2004 a 0 1 0 TeXcolorrgb
-FA(24)p 0 1 0 TeXcolorrgb 2720 1951 a
+Fx(22)p 0 1 0 TeXcolorrgb 2720 1951 a
SDict begin H.R end
2720 1951 a 2720
2004 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.perng2005csr) cvn H.B /ANN pdfmark end
- 2720 2004 a Black FA(],)h(the)f(adv)n(ersary)e(is)523
+ 2720 2004 a Black Fx(],)h(the)f(adv)n(ersary)e(is)523
2104 y(gran)n(ted)26 b(extensiv)n(e)h(capabilities.)g(In)g(particular,)
g(the)g(adv)n(ersary)e(is)i(allo)n(w)n(ed)f(to)h(insp)r(ect)523
2204 y(ev)n(ery)33 b(request)g(or)g(resp)r(onse,)g(transcript)g(the)h
@@ -6009,20 +5455,20 @@
0 1 0 TeXcolorrgb 1821 3001 a
SDict begin H.S end
1821 3001 a 0 1 0 TeXcolorrgb
-FA(24)p 0 1 0 TeXcolorrgb 1904 2947 a
+Fx(22)p 0 1 0 TeXcolorrgb 1904 2947 a
SDict begin H.R end
1904 2947 a 1904
3001 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.perng2005csr) cvn H.B /ANN pdfmark end
- 1904 3001 a Black FA(])h(sho)n(ws)e(that)i(censorship)f
+ 1904 3001 a Black Fx(])h(sho)n(ws)e(that)i(censorship)f
(resistance)f(requires)523 3100 y(a)27 b(form)h(of)f(priv)-5
b(ate)28 b(information)f(retriev)-5 b(al)27 b(for)g(whic)n(h)h(eac)n(h)
-f(op)r(eration)f(has)i(complexit)n(y)523 3200 y Fs(O)r
-FA(\()p Fs(n)p FA(\),)h(where)e Fs(n)g FA(is)g(the)h(size)f(of)h(the)f
+f(op)r(eration)f(has)i(complexit)n(y)523 3200 y Fp(O)r
+Fx(\()p Fp(n)p Fx(\),)h(where)e Fp(n)g Fx(is)g(the)h(size)f(of)h(the)f
(datastore.)f(In)i(return)f(for)g(restricting)f(the)i(guessing)523
3300 y(capabilities)i(of)h(the)g(adv)n(ersary)-7 b(,)27
-b(ECRS)k(can)f(ac)n(hiev)n(e)f Fs(O)r FA(\(1\))j(complexit)n(y)e(for)g
+b(ECRS)k(can)f(ac)n(hiev)n(e)f Fp(O)r Fx(\(1\))j(complexit)n(y)e(for)g
(its)g(op)r(era-)523 3399 y(tions.)24 b(Considering)f(that)h
(scalabilit)n(y)g(is)g(also)f(an)h(imp)r(ortan)n(t)f(goal,)g(w)n(e)h(b)
r(eliev)n(e)g(that)h(this)523 3499 y(is)j(a)f(reasonable)e
@@ -6050,24 +5496,24 @@
0 1 0 TeXcolorrgb 1695 4625 a
SDict begin H.S end
1695 4625 a 0 1 0 TeXcolorrgb
-FA(5)p 0 1 0 TeXcolorrgb 1737 4572 a
+Fx(5)p 0 1 0 TeXcolorrgb 1737 4572 a
SDict begin H.R end
1737 4572 a 1737
4625 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.clark99distributed) cvn H.B /ANN pdfmark end
- 1737 4625 a Black FA(])g(and)f(later)h(termed)f
-Ft(c)l(onver)l(gent)j(encryption)f FA([)p 0 1 0 TeXcolorrgb
+ 1737 4625 a Black Fx(])g(and)f(later)h(termed)f
+Fq(c)l(onver)l(gent)j(encryption)f Fx([)p 0 1 0 TeXcolorrgb
3276 4625 a
SDict begin H.S end
- 3276 4625 a 0 1 0 TeXcolorrgb FA(10)p 0 1 0
+ 3276 4625 a 0 1 0 TeXcolorrgb Fx(10)p 0 1 0
TeXcolorrgb 3359 4572 a
SDict begin H.R end
3359 4572 a 3359 4625 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.farsite) cvn H.B /ANN pdfmark end
3359
-4625 a Black FA(].)523 4725 y(With)k(con)n(v)n(ergen)n(t)c(encryption,)
+4625 a Black Fx(].)523 4725 y(With)k(con)n(v)n(ergen)n(t)c(encryption,)
j(the)g(existence)f(of)h(m)n(ultiple)g(copies)g(of)f(the)h(same)g(con-)
523 4825 y(ten)n(t)21 b(can)g(b)r(e)g(detected;)g(this)g(kno)n(wledge)f
(can)g(then)i(b)r(e)f(used)g(to)g(increase)e(fault-tolerance,)523
@@ -6088,9 +5534,9 @@
523 232 a 523 232 a
SDict begin [ /View [/XYZ H.V] /Dest (page.3) cvn H.B /DEST pdfmark
end
- 523 232 a Black 1036 w Fx(An)25
+ 523 232 a Black 1036 w Fu(An)25
b(Enco)r(ding)h(for)h(Censorship-Resistan)n(t)f(Sharing)238
-b(3)p Black 648 448 a FA(Unfortunately)-7 b(,)26 b(it)g(is)g(not)g
+b(3)p Black 648 448 a Fx(Unfortunately)-7 b(,)26 b(it)g(is)g(not)g
(enough)g(to)g(just)g(meet)h(requiremen)n(ts)e(related)g(to)h
(e\016cien)n(t)523 548 y(storage)c(and)h(retriev)-5 b(al)22
b(of)i(the)g(con)n(ten)n(t.)f(A)h(public)g(\014lesharing)e(net)n(w)n
@@ -6099,7 +5545,7 @@
(trol.)g(This)h(op)r(ens)523 747 y(the)c(net)n(w)n(ork)f(to)g
(malicious)g(participan)n(ts.)g(Th)n(us,)h(the)g(enco)r(ding)g(sc)n
(heme)f(should)h(guar-)523 847 y(an)n(tee)24 b(the)g
-Ft(inte)l(grity)h FA(of)f(the)h(con)n(ten)n(t,)f(ev)n(en)g(in)g(the)h
+Fq(inte)l(grity)h Fx(of)f(the)h(con)n(ten)n(t,)f(ev)n(en)g(in)g(the)h
(presence)e(of)h(malicious)g(participan)n(ts.)523 946
y(The)i(enco)r(ding)f(mec)n(hanism)h(m)n(ust)g(ensure)f(that)h(in)n(v)
-5 b(alid)26 b(replies)f(are)g(detected)h(and)g(that)523
@@ -6122,216 +5568,179 @@
f(those)h(in)h([)p 0 1 0 TeXcolorrgb 1897 1843 a
SDict begin H.S end
1897
-1843 a 0 1 0 TeXcolorrgb FA(13)p 0 1 0 TeXcolorrgb 1980
+1843 a 0 1 0 TeXcolorrgb Fx(12)p 0 1 0 TeXcolorrgb 1980
1790 a
SDict begin H.R end
1980 1790 a 1980 1843 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.ebe2003) cvn H.B /ANN pdfmark end
- 1980 1843 a Black FA(]\))f(and)g(prev)n
+ 1980 1843 a Black Fx(]\))f(and)g(prev)n
(en)n(ts)f(the)i(retransmission)d(and)523 1943 y(replication)d(of)g
(corrupted)g(data)g(b)n(y)g(non-malicious)g(p)r(eers.)648
-2044 y(This)20 b(pap)r(er)h(in)n(tro)r(duces)f(the)h(primitiv)n(es)g
+2053 y(This)20 b(pap)r(er)h(in)n(tro)r(duces)f(the)h(primitiv)n(es)g
(that)g(ECRS)f(uses)h(to)g(ac)n(hiev)n(e)e(these)i(goals:)e(a)523
-2144 y(sp)r(eci\014c)26 b(altered)e(v)-5 b(arian)n(t)25
+2152 y(sp)r(eci\014c)26 b(altered)e(v)-5 b(arian)n(t)25
b(of)g(the)h(Con)n(ten)n(t)f(Hash)g(Key)g(\(CHK\),)h(a)f(primitiv)n(e)g
-(used)h(in)f([)p 0 1 0 TeXcolorrgb 3317 2144 a
+(used)h(in)f([)p 0 1 0 TeXcolorrgb 3317 2152 a
SDict begin H.S end
- 3317 2144
-a 0 1 0 TeXcolorrgb FA(5)p 0 1 0 TeXcolorrgb 3359 2090
+ 3317 2152
+a 0 1 0 TeXcolorrgb Fx(5)p 0 1 0 TeXcolorrgb 3359 2099
a
SDict begin H.R end
- 3359 2090 a 3359 2144 a
+ 3359 2099 a 3359 2152 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.clark99distributed) cvn H.B /ANN pdfmark end
- 3359 2144 a Black FA(],)523
-2244 y(and)e Ft(KBlo)l(cks)p FA(,)h(a)e(no)n(v)n(el)g(construction)g
+ 3359 2152 a Black Fx(],)523
+2252 y(and)e Fq(KBlo)l(cks)p Fx(,)h(a)e(no)n(v)n(el)g(construction)g
(whic)n(h)h(adds)f(functionalit)n(y)h(to)g(the)g(ECRS)f(sc)n(heme)523
-2343 y(while)27 b(a)n(v)n(oiding)e(a)i(prop)r(osed)f(attac)n(k)g(on)g
+2352 y(while)27 b(a)n(v)n(oiding)e(a)i(prop)r(osed)f(attac)n(k)g(on)g
(the)i(triple-hash)e(primitiv)n(e)g(used)h(in)h([)p 0 1 0
-TeXcolorrgb 3078 2343 a
+TeXcolorrgb 3078 2352 a
SDict begin H.S end
- 3078 2343 a 0 1 0 TeXcolorrgb
-FA(2)p 0 1 0 TeXcolorrgb 3119 2290 a
+ 3078 2352 a 0 1 0 TeXcolorrgb
+Fx(3)p 0 1 0 TeXcolorrgb 3119 2298 a
SDict begin H.R end
- 3119 2290 a 3119
-2343 a
+ 3119 2298 a 3119
+2352 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.esed) cvn H.B /ANN pdfmark end
- 3119 2343 a Black FA(].)f(These)523 2443 y(primitiv)n(es)k(allo)
+ 3119 2352 a Black Fx(].)f(These)523 2451 y(primitiv)n(es)k(allo)
n(w)f(data)g(to)h(b)r(e)h(inserted)e(under)h(m)n(ultiple)h
-(natural-language)c(k)n(eyw)n(ords)523 2542 y(at)g(minimal)h(cost)f(in)
+(natural-language)c(k)n(eyw)n(ords)523 2551 y(at)g(minimal)h(cost)f(in)
h(space,)f(and)g(queried)g(using)g(natural)g(language)f(b)r(o)r(olean)h
-(searc)n(hes.)523 2642 y(F)-7 b(urthermore,)27 b(the)i(primitiv)n(es)f
+(searc)n(hes.)523 2651 y(F)-7 b(urthermore,)27 b(the)i(primitiv)n(es)f
(giv)n(e)f(ECRS)h(the)h(means)f(to)g(iden)n(tify)-7 b(,)29
-b(encrypt,)f(decrypt)523 2742 y(and)33 b(v)n(erify)f(data,)g(all)h
+b(encrypt,)f(decrypt)523 2750 y(and)33 b(v)n(erify)f(data,)g(all)h
(while)g(a)n(v)n(oiding)e(attac)n(ks)g(b)n(y)i(a)f(non-guessing)f(in)n
-(termediate)i(ad-)523 2841 y(v)n(ersary)-7 b(.)29 b(V)-7
+(termediate)i(ad-)523 2850 y(v)n(ersary)-7 b(.)29 b(V)-7
b(eri\014cation)30 b(of)h(con)n(ten)n(t)g(b)n(y)g(in)n(termediate)f
-(hosts)h(is)g(made)g(p)r(ossible)g(without)523 2941 y(rev)n(ealing)i
+(hosts)h(is)g(made)g(p)r(ossible)g(without)523 2949 y(rev)n(ealing)i
(the)i(k)n(eys)f(necessary)f(to)i(decrypt)f(con)n(ten)n(t,)h(and)g(the)
-g(amoun)n(t)f(of)h(data)f(cor-)523 3041 y(ruption)28
+g(amoun)n(t)f(of)h(data)f(cor-)523 3049 y(ruption)28
b(an)f(adv)n(ersary)e(can)j(inject)g(b)r(efore)g(b)r(eing)g(detected)g
-(is)g(limited)h(to)e(a)h(small)f(size.)523 3140 y(Additionally)-7
+(is)g(limited)h(to)e(a)h(small)f(size.)523 3149 y(Additionally)-7
b(,)34 b(the)g(construction)f(of)h(these)g(primitiv)n(es)g(mak)n(es)e
-(ECRS)i(quite)g(scalable,)523 3240 y(and)24 b(assists)f(the)h(enco)r
+(ECRS)i(quite)g(scalable,)523 3248 y(and)24 b(assists)f(the)h(enco)r
(ding)g(sc)n(heme)g(in)g(encouraging)e(load-balancing,)g(distribution)i
-(and)523 3339 y(replication)i(of)g(con)n(ten)n(t,)g(and)h(sw)n(arming.)
+(and)523 3348 y(replication)i(of)g(con)n(ten)n(t,)g(and)h(sw)n(arming.)
d(These)j(primitiv)n(es)f(\(and)g(their)h(functionalit)n(y\))523
-3439 y(are)g(describ)r(ed)g(in)h(greater)e(detail)h(later)g(in)h(the)g
-(pap)r(er.)648 3541 y(The)e(rest)f(of)i(the)f(pap)r(er)g(is)g
+3448 y(are)g(describ)r(ed)g(in)h(greater)e(detail)h(later)g(in)h(the)g
+(pap)r(er.)648 3558 y(The)e(rest)f(of)i(the)f(pap)r(er)g(is)g
(organized)e(as)i(follo)n(ws.)f(Section)p 1 0 0 TeXcolorrgb
-2582 3541 a
+2582 3558 a
SDict begin H.S end
- 2582 3541 a 1 0 0 TeXcolorrgb FA(2)p 1 0 0
-TeXcolorrgb 2624 3487 a
+ 2582 3558 a 1 0 0 TeXcolorrgb Fx(2)p 1 0 0
+TeXcolorrgb 2624 3504 a
SDict begin H.R end
- 2624 3487 a 2624 3541 a
+ 2624 3504 a 2624 3558 a
SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(section.1.2) cvn H.B /ANN pdfmark end
2624
-3541 a Black 26 w FA(con)n(trasts)f(the)j(curren)n(t)523
-3640 y(w)n(ork)e(with)i(mec)n(hanisms)e(used)h(in)h(other)f
+3558 a Black 26 w Fx(con)n(trasts)f(the)j(curren)n(t)523
+3657 y(w)n(ork)e(with)i(mec)n(hanisms)e(used)h(in)h(other)f
(censorship-resistan)n(t)d(systems.)j(Section)p 1 0 0
-TeXcolorrgb 3226 3640 a
+TeXcolorrgb 3226 3657 a
SDict begin H.S end
- 3226 3640 a 1 0 0 TeXcolorrgb
-FA(3)p 1 0 0 TeXcolorrgb 3268 3587 a
+ 3226 3657 a 1 0 0 TeXcolorrgb
+Fx(3)p 1 0 0 TeXcolorrgb 3268 3604 a
SDict begin H.R end
- 3268 3587 a 3268
-3640 a
+ 3268 3604 a 3268
+3657 a
SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(section.1.3) cvn H.B /ANN pdfmark end
- 3268 3640 a Black 26 w FA(de-)523 3740 y(scrib)r(es)j(the)g
-(ECRS)h(enco)r(ding)e(sc)n(heme)h(in)h(detail.)f(Section)p
-1 0 0 TeXcolorrgb 2476 3740 a
+ 3268 3657 a Black 26 w Fx(de-)523 3757 y(scrib)r(es)e(the)h
+(ECRS)g(enco)r(ding)f(sc)n(heme)h(in)g(detail.)f(Finally)-7
+b(,)25 b(Section)p 1 0 0 TeXcolorrgb 2735 3757 a
SDict begin H.S end
- 2476 3740 a 1 0 0 TeXcolorrgb
-FA(4)p 1 0 0 TeXcolorrgb 2517 3686 a
+ 2735
+3757 a 1 0 0 TeXcolorrgb Fx(4)p 1 0 0 TeXcolorrgb 2776
+3703 a
SDict begin H.R end
- 2517 3686 a 2517
-3740 a
+ 2776 3703 a 2776 3757 a
SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(section.1.4) cvn H.B /ANN pdfmark end
- 2517 3740 a Black 29 w FA(lists)h(some)f(extensions)f(to)523
-3840 y(the)f(basic)g(sc)n(heme.)g(Finally)-7 b(,)27 b(Section)p
-1 0 0 TeXcolorrgb 1768 3840 a
+ 2776 3757 a Black 25 w
+Fx(discusses)f(attac)n(ks)523 3857 y(on)j(ECRS)h(and)f(con)n(trasts)f
+(it)i(with)g(previous)f(w)n(ork.)523 4064 y
SDict begin H.S end
- 1768 3840 a 1 0 0 TeXcolorrgb
-FA(5)p 1 0 0 TeXcolorrgb 1809 3786 a
-SDict begin H.R end
- 1809 3786 a 1809
-3840 a
-SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(section.1.5) cvn H.B /ANN pdfmark end
- 1809 3840 a Black 27 w FA(discusses)g(attac)n(ks)f(on)g(ECRS)h
-(and)g(con)n(trasts)f(it)523 3939 y(with)i(previous)f(w)n(ork.)648
-4041 y(This)d(w)n(ork)f(builds)h(on)g(our)g(earlier)f(pap)r(er)h([)p
-0 1 0 TeXcolorrgb 2036 4041 a
-SDict begin H.S end
- 2036 4041 a 0 1 0 TeXcolorrgb
-FA(2)p 0 1 0 TeXcolorrgb 2077 3987 a
-SDict begin H.R end
- 2077 3987 a 2077
-4041 a
-SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(cite.esed) cvn H.B /ANN pdfmark end
- 2077 4041 a Black FA(])h(whic)n(h)f(w)n(as)f(\014rst)h
-(published)h(at)f(A)n(CISP)523 4141 y(2001.)33 b(Since)h(then,)h(the)g
-(enco)r(ding)f(sc)n(heme)g(has)g(b)r(een)h(revised)e(to)h(address)g
-(additional)523 4240 y(requiremen)n(ts)29 b(an)h(to)h(impro)n(v)n(e)e
-(the)i(securit)n(y)e(in)i(v)-5 b(arious)29 b(asp)r(ects.)h(This)h(pap)r
-(er)f(re\015ects)523 4340 y(these)e(c)n(hanges.)523 4513
-y
-SDict begin H.S end
- 523 4513 a 523 4513 a
+ 523 4064
+a 523 4064 a
SDict begin 12 H.A end
- 523 4513 a 523 4513 a
+ 523 4064 a 523 4064 a
SDict begin [ /View [/XYZ H.V] /Dest (section.1.2) cvn H.B /DEST pdfmark
end
- 523 4513
-a 102 x Fu(2)112 b(Related)38 b(W)-9 b(ork)523 4825 y
-FA(A)40 b(large)f(n)n(um)n(b)r(er)g(of)h(censorship-resistan)n(t)d
-(\(or)j(at)f(least)h(fault-toleran)n(t\))f(publishing)523
-4924 y(systems)30 b(ha)n(v)n(e)f(b)r(een)h(prop)r(osed)f(in)i(recen)n
-(t)e(y)n(ears)g([)p 0 1 0 TeXcolorrgb 2170 4924 a
+ 523 4064 a 111 x Fr(2)112
+b(Related)38 b(W)-9 b(ork)523 4426 y Fx(A)23 b(large)d(n)n(um)n(b)r(er)
+i(of)g(censorship-resistan)n(t)e(\(or)h(at)h(least)g(fault-toleran)n
+(t\))g(publishing)g(sys-)523 4526 y(tems)g(ha)n(v)n(e)f(b)r(een)i(prop)
+r(osed)e(in)h(recen)n(t)g(y)n(ears)e([)p 0 1 0 TeXcolorrgb
+2004 4526 a
SDict begin H.S end
- 2170
-4924 a 0 1 0 TeXcolorrgb FA(1)p 0 1 0 TeXcolorrgb 2211
-4871 a
+ 2004 4526 a 0 1 0 TeXcolorrgb Fx(1)p 0 1 0
+TeXcolorrgb 2046 4472 a
SDict begin H.R end
- 2211 4871 a 2211 4924 a
+ 2046 4472 a 2046 4526 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.anderson96eternity) cvn H.B /ANN pdfmark end
- 2211 4924 a Black FA(,)p
-0 1 0 TeXcolorrgb 2234 4924 a
+ 2046
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SDict begin H.S end
- 2234 4924 a 0 1 0 TeXcolorrgb
-FA(4)p 0 1 0 TeXcolorrgb 2276 4871 a
+ 2069
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SDict begin H.R end
- 2276 4871 a 2276
-4924 a
+ 2110 4472 a 2110 4526 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.chen99prototype) cvn H.B /ANN pdfmark end
- 2276 4924 a Black FA(,)p 0 1 0 TeXcolorrgb 2299
-4924 a
+ 2110 4526 a Black Fx(,)p
+0 1 0 TeXcolorrgb 2133 4526 a
SDict begin H.S end
- 2299 4924 a 0 1 0 TeXcolorrgb FA(5)p 0 1 0 TeXcolorrgb
-2341 4871 a
+ 2133 4526 a 0 1 0 TeXcolorrgb
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SDict begin H.R end
- 2341 4871 a 2341 4924 a
+ 2175 4472 a 2175
+4526 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.clark99distributed) cvn H.B /ANN pdfmark end
- 2341 4924 a Black
-FA(,)p 0 1 0 TeXcolorrgb 2364 4924 a
+ 2175 4526 a Black Fx(,)p 0 1 0 TeXcolorrgb 2198
+4526 a
SDict begin H.S end
- 2364 4924 a 0 1 0
-TeXcolorrgb FA(9)p 0 1 0 TeXcolorrgb 2405 4871 a
+ 2198 4526 a 0 1 0 TeXcolorrgb Fx(14)p 0 1 0 TeXcolorrgb
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SDict begin H.R end
- 2405
-4871 a 2405 4924 a
+ 2281 4472 a 2281 4526 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(cite.freehaven-berk) cvn H.B /ANN pdfmark end
- 2405 4924 a Black FA(,)p 0 1 0 TeXcolorrgb
-2428 4924 a
-SDict begin H.S end
- 2428 4924 a 0 1 0 TeXcolorrgb FA(11)p 0 1 0
-TeXcolorrgb 2511 4871 a
-SDict begin H.R end
- 2511 4871 a 2511 4924 a
-SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(cite.feamster-infranet) cvn H.B /ANN pdfmark end
- 2511
-4924 a Black FA(,)p 0 1 0 TeXcolorrgb 2534 4924 a
-SDict begin H.S end
- 2534
-4924 a 0 1 0 TeXcolorrgb FA(16)p 0 1 0 TeXcolorrgb 2617
-4871 a
-SDict begin H.R end
- 2617 4871 a 2617 4924 a
-SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.herlihy87how) cvn H.B /ANN pdfmark end
- 2617 4924 a Black FA(,)p
-0 1 0 TeXcolorrgb 2640 4924 a
+ 2281 4526 a Black
+Fx(,)p 0 1 0 TeXcolorrgb 2304 4526 a
SDict begin H.S end
- 2640 4924 a 0 1 0 TeXcolorrgb
-FA(31)p 0 1 0 TeXcolorrgb 2723 4871 a
+ 2304 4526 a 0 1 0
+TeXcolorrgb Fx(29)p 0 1 0 TeXcolorrgb 2387 4472 a
SDict begin H.R end
- 2723 4871 a 2723
-4924 a
+ 2387
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SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.waldman2001tangler) cvn H.B /ANN pdfmark end
- 2723 4924 a Black FA(,)p 0 1 0 TeXcolorrgb 2746
-4924 a
+ 2387 4526 a Black Fx(,)p 0 1 0 TeXcolorrgb
+2410 4526 a
SDict begin H.S end
- 2746 4924 a 0 1 0 TeXcolorrgb FA(32)p 0 1 0 TeXcolorrgb
-2829 4871 a
+ 2410 4526 a 0 1 0 TeXcolorrgb Fx(30)p 0 1 0
+TeXcolorrgb 2493 4472 a
SDict begin H.R end
- 2829 4871 a 2829 4924 a
+ 2493 4472 a 2493 4526 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.pub00) cvn H.B /ANN pdfmark end
- 2829 4924 a Black
-FA(].)i(The)f(prop)r(osed)p Black Black eop end
+ 2493
+4526 a Black Fx(].)i(The)g(prop)r(osed)f(proto)r(cols)523
+4625 y(di\013er)33 b(in)f(v)-5 b(arious)32 b(asp)r(ects)g(unrelated)g
+(to)g(the)h(sp)r(eci\014cs)f(of)h(the)f(enco)r(ding)g(mec)n(hanism,)523
+4725 y(suc)n(h)23 b(as)g(con)n(ten)n(t)f(replication)h(and)g(the)h(use)
+f(of)g(anon)n(ymous)f(or)g(steganographic)f(comm)n(u-)523
+4825 y(nication.)29 b(Characteristic)g(of)g(all)h(of)f(these)h(systems)
+f(is)h(the)g(use)g(of)f(replication)g(and)h(the)523 4924
+y(need)h(to)g(ensure)g(data)g(in)n(tegrit)n(y)-7 b(.)30
+b(F)-7 b(or)30 b(an)h(o)n(v)n(erview)e(of)i(con)n(ten)n(t)g
+(replication)f(strategies)p Black Black eop end
%%Page: 4 4
TeXDict begin 4 3 bop 0 0 a
SDict begin /product where{pop product(Distiller)search{pop pop pop
@@ -6347,123 +5756,119 @@
523 232 a 523 232 a
SDict begin [ /View [/XYZ H.V] /Dest (page.4) cvn H.B /DEST pdfmark
end
- 523 232 a Black Fx(4)237 b(C.)27
+ 523 232 a Black Fu(4)237 b(C.)27
b(Grotho\013,)f(K.)g(Grotho\013,)g(T.)h(Horozo)n(v,)f(J.T.)h(Lindgren)p
-Black 523 448 a FA(proto)r(cols)18 b(di\013er)i(in)g(v)-5
-b(arious)18 b(asp)r(ects)h(unrelated)g(to)h(the)f(sp)r(eci\014cs)h(of)f
-(the)h(enco)r(ding)f(mec)n(h-)523 548 y(anism,)28 b(suc)n(h)g(as)f(con)
-n(ten)n(t)h(replication)f(and)h(the)g(use)g(of)g(anon)n(ymous)e(or)i
-(steganographic)523 648 y(comm)n(unication.)33 b(Characteristic)g(of)h
-(all)g(of)g(these)g(systems)f(is)h(the)h(use)f(of)g(replication)523
-747 y(and)i(the)h(need)f(to)h(ensure)e(data)h(in)n(tegrit)n(y)-7
-b(.)36 b(F)-7 b(or)35 b(an)h(o)n(v)n(erview)f(of)h(con)n(ten)n(t)g
-(replication)523 847 y(strategies)26 b(see)h([)p 0 1 0
-TeXcolorrgb 1050 847 a
+Black 523 448 a Fx(see)i([)p 0 1 0 TeXcolorrgb 682 448
+a
SDict begin H.S end
- 1050 847 a 0 1 0 TeXcolorrgb FA(6)p
-0 1 0 TeXcolorrgb 1091 793 a
+ 682 448 a 0 1 0 TeXcolorrgb Fx(6)p 0 1 0 TeXcolorrgb
+724 395 a
SDict begin H.R end
- 1091 793 a 1091 847 a
+ 724 395 a 724 448 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.cohen02replication) cvn H.B /ANN pdfmark end
- 1091
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-(use)g(some)g(form)g(of)g(con)n(ten)n(t)523 946 y(enco)r(ding)g(to)h
-(hide)g(the)g(sp)r(eci\014cs)f(of)h(the)g(con)n(ten)n(t)f(from)g(the)h
-(serv)n(ers.)523 1100 y
+ 724 448 a Black Fx(].)g(The)h
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+(eci\014cs)g(of)f(the)h(con)n(ten)n(t)g(from)f(the)h(serv)n(ers.)523
+735 y
SDict begin H.S end
- 523 1100 a 523 1100 a
+ 523 735 a 523 735 a
SDict begin 12 H.A end
- 523 1100
-a 523 1100 a
+ 523 735 a 523 735 a
SDict begin [ /View [/XYZ H.V] /Dest (subsection.1.2.1) cvn H.B /DEST
pdfmark end
- 523 1100 a 84 x Fr(2.1)95 b(F)-8 b(reenet)523
-1338 y FA(The)30 b(main)f(con)n(ten)n(t)h(enco)r(ding)f(sc)n(heme)g
-(used)h(in)g(F)-7 b(reenet)30 b([)p 0 1 0 TeXcolorrgb
-2452 1338 a
+ 523 735
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+b(main)f(con)n(ten)n(t)h(enco)r(ding)f(sc)n(heme)g(used)h(in)g(F)-7
+b(reenet)30 b([)p 0 1 0 TeXcolorrgb 2452 1017 a
SDict begin H.S end
- 2452 1338 a 0 1 0 TeXcolorrgb FA(5)p 0 1 0
-TeXcolorrgb 2493 1284 a
+ 2452
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+964 a
SDict begin H.R end
- 2493 1284 a 2493 1338 a
+ 2493 964 a 2493 1017 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.clark99distributed) cvn H.B /ANN pdfmark end
- 2493
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-1437 y(the)e(con)n(ten)n(t)f(is)g(used)g(as)g(the)g(k)n(ey)-7
-b(.)26 b(F)-7 b(reenet)26 b(has)g(sev)n(eral)e(other)i(t)n(yp)r(es)g
-(of)g(k)n(eys)g(whic)n(h)g(are)523 1537 y(used)e(to)f(refer)g(the)h
-(user)f(to)g(con)n(ten)n(t-hash)g(k)n(eys.)f(These)i(di\013eren)n(t)f
-(k)n(ey)g(t)n(yp)r(es)h(are)f(used)g(to)523 1637 y(allo)n(w)e
-(additional)h(features)g(suc)n(h)g(as)g(con)n(ten)n(t)g(signing,)g(p)r
-(ersonal)f(namespaces)h(and)g(split-)523 1736 y(ting)28
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-e(encrypted)g(data)h(for)f(indep)r(enden)n(t)523 1836
-y(encryptions.)g(Ho)n(w)n(ev)n(er,)f(it)i(has)f(sev)n(eral)e(disadv)-5
-b(an)n(tages.)648 1936 y(One)31 b(dra)n(wbac)n(k)g(of)h(F)-7
-b(reenet's)32 b(CHK)g(is)g(that)g(it)h(do)r(es)f(not)g(allo)n(w)f
-(direct)h(sharing)f(of)523 2035 y(\014les)c(from)f(the)h(lo)r(cal)g
+ 2493 1017 a Black Fx(])g(uses)f(CHKs:)h
+(the)g(hash)f(of)523 1117 y(the)e(con)n(ten)n(t)f(is)g(used)g(as)g(the)
+g(k)n(ey)-7 b(.)26 b(F)-7 b(reenet)26 b(has)g(sev)n(eral)e(other)i(t)n
+(yp)r(es)g(of)g(k)n(eys)g(whic)n(h)g(are)523 1216 y(used)e(to)f(refer)g
+(the)h(user)f(to)g(con)n(ten)n(t-hash)g(k)n(eys.)f(These)i(di\013eren)n
+(t)f(k)n(ey)g(t)n(yp)r(es)h(are)f(used)g(to)523 1316
+y(allo)n(w)e(additional)h(features)g(suc)n(h)g(as)g(con)n(ten)n(t)g
+(signing,)g(p)r(ersonal)f(namespaces)h(and)g(split-)523
+1416 y(ting)28 b(of)g(con)n(ten)n(t.)f(F)-7 b(reenet's)28
+b(CHK)g(yields)f(the)i(same)e(encrypted)g(data)h(for)f(indep)r(enden)n
+(t)523 1515 y(encryptions.)g(Ho)n(w)n(ev)n(er,)f(it)i(has)f(sev)n(eral)
+e(disadv)-5 b(an)n(tages.)648 1620 y(One)31 b(dra)n(wbac)n(k)g(of)h(F)
+-7 b(reenet's)32 b(CHK)g(is)g(that)g(it)h(do)r(es)f(not)g(allo)n(w)f
+(direct)h(sharing)f(of)523 1720 y(\014les)c(from)f(the)h(lo)r(cal)g
(driv)n(e)e(without)j(encrypting)e(and)g(inserting)h(them)g(\014rst.)g
-(Th)n(us,)f(if)h(a)523 2135 y(no)r(de)22 b(op)r(erator)f(wishes)h(to)g
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(k)n(eep)g(con)n(ten)n(t)g(directly)g(accessible)f(on)h(the)h(host,)f
-(a)g(lo)r(cal)g(cop)n(y)523 2234 y(of)h(the)g(plain)n(text)g(m)n(ust)g
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(b)r(e)g(k)n(ept)f(in)h(addition)g(to)g(the)g(encrypted)f(con)n(ten)n
-(t)h(in)g(the)g(F)-7 b(reenet)523 2334 y(database.)27
+(t)h(in)g(the)g(F)-7 b(reenet)523 2019 y(database.)27
b(Also,)h(F)-7 b(reenet)29 b(do)r(es)f(not)g(supp)r(ort)g(sw)n(arming.)
-f(One)h(reason)f(for)h(this)g(is)h(that)523 2434 y(F)-7
+f(One)h(reason)f(for)h(this)g(is)h(that)523 2119 y(F)-7
b(reenet's)30 b(CHK)h(enco)r(ding)f(can)g(only)g(v)n(erify)g(a)g
(\014le)h(in)f(its)h(en)n(tiret)n(y)f(and)g(not)h(pin-p)r(oin)n(t)523
-2533 y(corruptions)26 b(on)h(a)h(smaller)e(scale.)648
-2633 y(One)33 b(w)n(a)n(y)f(to)i(obtain)f(the)i(CHK)e(k)n(ey)g(of)h(a)f
+2218 y(corruptions)26 b(on)h(a)h(smaller)e(scale.)648
+2323 y(One)33 b(w)n(a)n(y)f(to)i(obtain)f(the)i(CHK)e(k)n(ey)g(of)h(a)f
(\014le)h(in)g(F)-7 b(reenet)34 b(is)f(to)h(searc)n(h)e(a)h(priv)-5
-b(ate)523 2733 y(subspace.)27 b(A)h(subspace)f(con)n(tains)f(a)i(set)f
+b(ate)523 2423 y(subspace.)27 b(A)h(subspace)f(con)n(tains)f(a)i(set)f
(of)h(CHK)f(k)n(eys)g(that)h(ha)n(v)n(e)e(b)r(een)i(cryptographi-)523
-2832 y(cally)e(signed)h(b)n(y)g(the)g(o)n(wner)f(of)h(the)g(subspace)g
+2522 y(cally)e(signed)h(b)n(y)g(the)g(o)n(wner)f(of)h(the)g(subspace)g
(and)f(placed)h(in)n(to)g(the)g(subspace)g(under)f(a)523
-2932 y(certain)e(k)n(eyw)n(ord.)g(These)g(signed)h(references)f(are)f
-(called)i(subspace-signed)e(k)n(eys)h(\(SSK\).)523 3031
+2622 y(certain)e(k)n(eyw)n(ord.)g(These)g(signed)h(references)f(are)f
+(called)i(subspace-signed)e(k)n(eys)h(\(SSK\).)523 2722
y(Giv)n(en)i(the)g(subspace-pre\014x)e(and)h(the)i(k)n(eyw)n(ord,)c
(users)i(can)h(obtain)f(the)h(CHK)g(k)n(ey)-7 b(.)25
-b(The)523 3131 y(form)d(of)g(the)g(k)n(eyw)n(ords)e(can)i(b)r(e)h
+b(The)523 2821 y(form)d(of)g(the)g(k)n(eyw)n(ords)e(can)i(b)r(e)h
(freely)e(c)n(hosen,)h(allo)n(wing)e(for)i(con)n(v)n(en)n(tions)e(suc)n
-(h)i(as)f(dates)523 3231 y(in)j(the)h(k)n(eyw)n(ord)d(to)i(b)r(e)h
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(used)f(for)g(up)r(dates)g(\(in)h(F)-7 b(reenet's)24
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-y Ft(date)30 b(b)l(ase)l(d)h(r)l(e)l(dir)l(e)l(cts)p
-FA(\).)648 3430 y(In)c(addition)h(to)f(CHK)g(and)g(SSK)h(k)n(eys,)e(F)
+b(terminology)-7 b(,)23 b(these)h(are)f(called)523 3021
+y Fq(date)30 b(b)l(ase)l(d)h(r)l(e)l(dir)l(e)l(cts)p
+Fx(\).)648 3126 y(In)c(addition)h(to)f(CHK)g(and)g(SSK)h(k)n(eys,)e(F)
-7 b(reenet)28 b(supp)r(orts)f(KSK)g(k)n(eys.)f(A)i(KSK)f(k)n(ey)523
-3530 y(is)j(essen)n(tially)f(a)g(CHK)h(k)n(ey)g(stored)f(in)h(plain)n
+3225 y(is)j(essen)n(tially)f(a)g(CHK)h(k)n(ey)g(stored)f(in)h(plain)n
(text)g(\(!\))h(under)e(a)h(k)n(eyw)n(ord.)e(The)i(proto)r(col)523
-3629 y(attempts)25 b(to)f(ensure)g(that)g(there)h(cannot)e(b)r(e)i(t)n
+3325 y(attempts)25 b(to)f(ensure)g(that)g(there)h(cannot)e(b)r(e)i(t)n
(w)n(o)f(di\013eren)n(t)g(CHK)h(k)n(eys)e(a)n(v)-5 b(ailable)23
-b(in)i(the)523 3729 y(net)n(w)n(ork)g(under)h(the)h(same)f(k)n(eyw)n
+b(in)i(the)523 3425 y(net)n(w)n(ork)g(under)h(the)h(same)f(k)n(eyw)n
(ord.)e(While)j(collisions)e(for)h(KSK)g(k)n(eys)f(are)g(supp)r(osedly)
-523 3828 y(not)36 b(allo)n(w)n(ed,)e(the)i(proto)r(col)e(cannot)h(prev)
+523 3524 y(not)36 b(allo)n(w)n(ed,)e(the)i(proto)r(col)e(cannot)h(prev)
n(en)n(t)g(them)h(from)f(o)r(ccurring.)g(If)h(an)f(attac)n(k)n(er)523
-3928 y(inserts)27 b(meaningless)f(data)h(under)g(a)g(common)g(k)n(eyw)n
+3624 y(inserts)27 b(meaningless)f(data)h(under)g(a)g(common)g(k)n(eyw)n
(ord,)e(F)-7 b(reenet)27 b(will)h(try)f(to)g(preserv)n(e)523
-4028 y(that)g(con)n(ten)n(t)g(b)r(ecause)f(it)h(is)g(frequen)n(tly)f
+3723 y(that)g(con)n(ten)n(t)g(b)r(ecause)f(it)h(is)g(frequen)n(tly)f
(requested.)h(Subsequen)n(tly)-7 b(,)26 b(that)h(k)n(eyw)n(ord)e(can)
-523 4127 y(no)h(longer)f(b)r(e)i(used)f(for)g(an)n(y)f(useful)i(data)f
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(since)g(the)g(p)r(eers)g(attempt)h(to)f(enforce)g(the)h(no-)523
-4227 y(collisions)j(rule.)h(Note)g(that)g(the)h(no-collision)d(rule)i
-(cannot)f(b)r(e)i(enforced)e(for)h(malicious)523 4327
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SDict begin H.R end
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SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.mazieres02building) cvn H.B /ANN pdfmark end
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SDict begin [ /View [/XYZ H.V] /Dest (section.1.3) cvn H.B /DEST pdfmark
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523
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SDict begin [ /Subtype /Link /Dest (Hfootnote.2) cvn /H /I /Border
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SDict begin H.R end
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SDict begin [ /View [/XYZ H.V] /Dest (Hfootnote.2) cvn H.B /DEST pdfmark
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y(p)r(oten)n(tially)19 b(ob)5 b(jectionable)18 b(con)n(ten)n(t)h(is)g
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(es)g(in)g(the)g(o)n(v)n(erall)d(enco)r(ding)j(sc)n(heme.)f(The)523
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SDict begin H.S end
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SDict begin H.R end
3359
-1514 a 3359 1567 a
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SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.clark99distributed) cvn H.B /ANN pdfmark end
- 3359 1567 a Black FA(],)523 1667 y(where)35
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b(CHK)h(stands)g(for)f(Con)n(ten)n(t)h(Hash)g(Key)-7
b(.)35 b(In)h(other)g(w)n(ords,)e(the)j(con)n(ten)n(t)e(is)h(en-)523
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(a)g(cryptographic)e(hash)h(of)i(the)f(plain)n(text.)523
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(obtain)g(the)g(query)g(hash)f(whic)n(h)h(is)g(used)g(to)523
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(is)h(what)g(the)g(receiv)n(er)f(needs)h(to)f(do)n(wnload)523
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y(The)38 b(primary)g(di\013erence)g(b)r(et)n(w)n(een)g(the)h(use)g(of)f
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-b([)p 0 1 0 TeXcolorrgb 644 2288 a
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SDict begin H.S end
- 644 2288 a 0 1 0 TeXcolorrgb
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SDict begin H.R end
- 685 2234 a 685 2288
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a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.clark99distributed) cvn H.B /ANN pdfmark end
- 685 2288 a Black FA(])g(is)f(that)h(ECRS)g(do)r(es)f(not)g(sub)5
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b(ject)29 b(en)n(tire)f(\014les)g(to)h(the)g(CHK)f(enco)r(ding.)g
-(Instead,)523 2387 y(\014les)f(are)g(split)h(in)n(to)f(\014xed-size)g
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(blo)r(c)n(ks)g(whic)n(h)g(could)g(then)h(b)r(e)g(individually)g
-(distributed)523 2487 y(\(and)34 b(replicated\))g(across)e(p)r(eers)i
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(in)h(the)f(net)n(w)n(ork;)f(this)i(is)f(a)f(natural)h(w)n(a)n(y)f(to)h
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(These)h(\014xed-sized)g(blo)r(c)n(ks)f(can)h(b)r(e)h(individually)523
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(eri\014ed.)f(Eac)n(h)g(blo)r(c)n(k)g(is)h(iden)n(ti\014ed)h(b)n(y)e
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r(c)n(ks)e(are)g(encrypted)h(using)g(a)g(k)n(ey)f(that)i(is)f(indep)r
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(ti\014cation.)g(V)-7 b(eri\014cation)25 b(only)g(requires)f(the)h
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(not)g(rev)n(eal)f(the)h(k)n(ey)f(required)g(to)h(decrypt)g(the)h(blo)r
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(to)g(forge)g(a)g(resp)r(onse)f(that)i(passes)e(v)n(eri\014cation)h
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(\014les)g(in)n(to)f(blo)r(c)n(ks)g(allo)n(ws)g(ECRS)g(to)h(detect)g
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(Malicious)g(p)r(eers)g(cannot)g(transmit)h(more)e(than)i(the)g
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b(alid)27 b(data)g(b)r(efore)h(b)r(eing)f(detected.)648
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(obtain)i(the)f(k)n(ey-query)f(pair)g(b)n(y)i(en)n(tering)e(a)h
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(the)h(con)n(ten)n(t)f(pro)n(vider.)g(The)g(primitiv)n(e)h(used)g(to)f
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-649 3805 a
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SDict begin H.S end
- 649 3805 a 0 1 0 TeXcolorrgb FA(2)p 0 1 0
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SDict begin H.R end
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SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.esed) cvn H.B /ANN pdfmark end
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(then)g(return)g(the)g(do)r(cumen)n(ts)g(whic)n(h)g(w)n(ere)523
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d(Before)j(the)g(do)n(wnload,)f(the)h(user)f(can)523
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y(o)n(v)n(erview,)29 b(P)n(art)p 1 0 0 TeXcolorrgb 1083
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SDict begin H.S end
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SDict begin H.R end
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SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(subsection.1.3.2) cvn H.B /ANN pdfmark end
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+727 V 1796 719 V 1809 711 V 1858 785 a Fl(\017)p Fk(\017)p
+1856 787 V 1856 771 V 1856 756 V 1856 741 V 1856 726
+V 1856 710 V 2050 799 a Fl(\045)p Fk(\045)p 2049 801
+V 2035 792 V 2022 784 V 2009 776 V 1996 768 V 1983 760
+V 1969 752 V 1956 743 V 1943 735 V 1930 727 V 1916 719
+V 1903 711 V 2543 702 a Fm(I)6 b(B)t(l)q(ock)2779 711
+y Fh(k)2461 759 y Fl(u)p Fk(u)2461 760 y Fi(k)2488 750
+y(k)2680 785 y Fl(\017)p Fk(\017)p 2678 785 V 2678 773
+V 2678 761 V 2678 749 V 2678 737 V 2894 759 a Fl(\))p
+Fk(\))2855 745 y Fi(S)2829 735 y(S)567 836 y Fm(D)r(B)t(l)q(ock)828
+844 y Fv(1)716 932 y Fl(\017)p Fk(\017)p 714 932 4 64
+v 1028 818 a Fm(:)13 b(:)g(:)1072 932 y Fl(\017)p Fk(\017)p
1071 934 4 4 v 1071 919 V 1071 904 V 1071 889 V 1071
-874 V 1071 859 V 1071 844 V 1281 836 a Fp(D)r(B)t(l)q(ock)1542
-845 y Fk(l)1424 932 y Fo(\017)p Fn(\017)p 1422 932 4
-63 v 1813 818 a Fp(:)g(:)g(:)1858 932 y Fo(\017)p Fn(\017)p
+874 V 1071 859 V 1071 844 V 1281 836 a Fm(D)r(B)t(l)q(ock)1542
+845 y Fh(l)1424 932 y Fl(\017)p Fk(\017)p 1422 932 4
+63 v 1813 818 a Fm(:)g(:)g(:)1858 932 y Fl(\017)p Fk(\017)p
1856 934 4 4 v 1856 919 V 1856 904 V 1856 889 V 1856
-874 V 1856 859 V 1856 844 V 2149 836 a Fp(D)r(B)t(l)q(ock)2410
-844 y Fk(m)2309 932 y Fo(\017)p Fn(\017)p 2307 932 4
-64 v 2635 818 a Fp(:)g(:)g(:)2680 932 y Fo(\017)p Fn(\017)p
+874 V 1856 859 V 1856 844 V 2149 836 a Fm(D)r(B)t(l)q(ock)2410
+844 y Fh(m)2309 932 y Fl(\017)p Fk(\017)p 2307 932 4
+64 v 2635 818 a Fm(:)g(:)g(:)2680 932 y Fl(\017)p Fk(\017)p
2678 934 4 4 v 2678 919 V 2678 904 V 2678 889 V 2678
-874 V 2678 859 V 2678 844 V 2890 836 a Fp(D)r(B)t(l)q(ock)3151
-844 y Fk(n)3042 932 y Fo(\017)p Fn(\017)p 3041 932 4
+874 V 2678 859 V 2678 844 V 2890 836 a Fm(D)r(B)t(l)q(ock)3151
+844 y Fh(n)3042 932 y Fl(\017)p Fk(\017)p 3041 932 4
64 v 522 936 2 2 v 524 937 2667 4 v 3191 936 2 2 v 521
1048 4 111 v 3193 1048 V 522 1051 2 2 v 524 1052 2667
-4 v 3191 1051 2 2 v 1603 1006 a Fw(Original)41 b(data)523
-1201 y Fr(Fig.)15 b(1.)p 0 TeXcolorgray 814 1102 a
+4 v 3191 1051 2 2 v 1603 1006 a Ft(Original)41 b(data)523
+1201 y Fo(Fig.)15 b(1.)p 0 TeXcolorgray 814 1102 a
SDict begin H.S end
814
1102 a 0 TeXcolorgray 0 TeXcolorgray 814 1102 a
@@ -7264,150 +6532,127 @@
a 814 1102 a
SDict begin [ /View [/XYZ H.V] /Dest (figure.1.1) cvn H.B /DEST pdfmark
end
- 814 1102 a Black 99 x FA(Simple)40 b(enco)r(ding)g(of)f(a)
+ 814 1102 a Black 99 x Fx(Simple)40 b(enco)r(ding)g(of)f(a)
h(\014le)g(using)f(a)h(tree)f(of)h(CHK)g(blo)r(c)n(ks)f(\()p
-Fs(D)r(B)t(l)r(ock)s FA(s)g(and)523 1301 y Fs(I)7 b(B)t(l)r(ock)s
-FA(s)41 b(are)f(CHK)i(enco)r(ded\))f(with)h(one)g Fs(K)6
-b(B)t(l)r(ock)43 b FA(to)e(allo)n(w)g(for)g(a)g(k)n(eyw)n(ord-based)523
-1400 y(searc)n(h.)p Black Black Black 523 1838 a(transmitting.)30
-b(P)n(art)p 1 0 0 TeXcolorrgb 1219 1838 a
+Fp(D)r(B)t(l)r(ock)s Fx(s)g(and)523 1301 y Fp(I)7 b(B)t(l)r(ock)s
+Fx(s)41 b(are)f(CHK)i(enco)r(ded\))f(with)h(one)g Fp(K)6
+b(B)t(l)r(ock)43 b Fx(to)e(allo)n(w)g(for)g(a)g(k)n(eyw)n(ord-based)523
+1400 y(searc)n(h.)p Black Black Black 523 1852 a(\(encrypted\))30
+b(query)-7 b(.)30 b(Finally)-7 b(,)30 b(the)g(core)f(of)h(ECRS)f(is)h
+(summarized)g(in)g(the)g(form)g(of)g(the)523 1951 y(enco)r(ding)d
+(algorithm)g(and)g(a)g(proto)r(col)g(example.)523 2127
+y
SDict begin H.S end
- 1219 1838 a
-1 0 0 TeXcolorrgb FA(3.3)p 1 0 0 TeXcolorrgb 1325 1784
-a
-SDict begin H.R end
- 1325 1784 a 1325 1838 a
-SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(subsection.1.3.3) cvn H.B /ANN pdfmark end
- 1325 1838 a Black 31 w FA(then)g(describ)r
-(es)f(ho)n(w)h(\014les)g(are)f(split)h(in)n(to)g(those)f(data)h(blo)r
-(c)n(ks.)523 1938 y(P)n(arts)p 1 0 0 TeXcolorrgb 747
-1938 a
-SDict begin H.S end
- 747 1938 a 1 0 0 TeXcolorrgb FA(3.4)p 1 0 0 TeXcolorrgb
-853 1884 a
-SDict begin H.R end
- 853 1884 a 853 1938 a
-SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(subsection.1.3.4) cvn H.B /ANN pdfmark end
- 853 1938 a Black 31
-w FA(through)p 1 0 0 TeXcolorrgb 1201 1938 a
-SDict begin H.S end
- 1201 1938
-a 1 0 0 TeXcolorrgb FA(3.6)p 1 0 0 TeXcolorrgb 1307 1884
-a
-SDict begin H.R end
- 1307 1884 a 1307 1938 a
-SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(subsection.1.3.6) cvn H.B /ANN pdfmark end
- 1307 1938 a Black 30 w FA(motiv)-5
-b(ate)31 b(and)g(explain)f(ho)n(w)g(ECRS)g(enables)g(users)g(to)h
-(searc)n(h)523 2037 y(for)c(con)n(ten)n(t)g(without)h(exp)r(osing)f
-(the)h(plain)n(text)f(of)h(the)g(k)n(eyw)n(ord)d(or)i(the)h(corresp)r
-(onding)523 2137 y(con)n(ten)n(t)d(and)g(ho)n(w)g(in)n(termediaries)f
-(can)h(v)n(erify)g(that)h(a)f(giv)n(en)f(encrypted)i(reply)f(matc)n
-(hes)523 2236 y(the)30 b(\(encrypted\))h(query)-7 b(.)29
-b(Finally)-7 b(,)30 b(the)g(core)f(of)h(ECRS)g(is)g(summarized)f(in)h
-(the)g(form)g(of)523 2336 y(the)e(enco)r(ding)f(algorithm)g(and)g(a)g
-(proto)r(col)g(example.)523 2493 y
-SDict begin H.S end
- 523 2493 a 523 2493
-a
+ 523 2127 a 523 2127 a
SDict begin 12 H.A end
- 523 2493 a 523 2493 a
+ 523 2127 a 523 2127 a
SDict begin [ /View [/XYZ H.V] /Dest (subsection.1.3.1) cvn H.B /DEST
pdfmark end
- 523 2493 a 83 x Fr(3.1)95 b(Ov)m(erview)523
-2734 y FA(In)25 b(ECRS,)f(the)h(enco)r(ded)g(represen)n(tation)e(of)h
-(a)g(\014le)h(is)f(a)h(collection)f(of)g(blo)r(c)n(ks.)g(There)g(are)
-523 2833 y(four)h(t)n(yp)r(es)g(of)g(blo)r(c)n(ks:)f
-Ft(DBlo)l(cks)p FA(,)i Ft(IBlo)l(cks)p FA(,)h Ft(SBlo)l(cks)f
-FA(and)f Ft(KBlo)l(cks)p FA(.)h(The)f(maxim)n(um)g(size)523
-2933 y(of)f(all)g(blo)r(c)n(ks)g(in)h(ECRS)f(is)g(supp)r(osed)g(to)h(b)
-r(e)f(\014xed)h(as)f(some)f(small)h(n)n(um)n(b)r(er)h(\(e.g.)f(32Kb\).)
-523 3032 y(The)i(blo)r(c)n(ks)f(are)g(used)h(to)g(create)f(a)h(tree)g
+ 523 2127
+a 86 x Fo(3.1)95 b(Ov)m(erview)523 2392 y Fx(In)25 b(ECRS,)f(the)h
+(enco)r(ded)g(represen)n(tation)e(of)h(a)g(\014le)h(is)f(a)h
+(collection)f(of)g(blo)r(c)n(ks.)g(There)g(are)523 2491
+y(four)h(t)n(yp)r(es)g(of)g(blo)r(c)n(ks:)f Fq(DBlo)l(cks)p
+Fx(,)i Fq(IBlo)l(cks)p Fx(,)h Fq(SBlo)l(cks)f Fx(and)f
+Fq(KBlo)l(cks)p Fx(.)h(The)f(maxim)n(um)g(size)523 2591
+y(of)f(all)g(blo)r(c)n(ks)g(in)h(ECRS)f(is)g(supp)r(osed)g(to)h(b)r(e)f
+(\014xed)h(as)f(some)f(small)h(n)n(um)n(b)r(er)h(\(e.g.)f(32Kb\).)523
+2691 y(The)i(blo)r(c)n(ks)f(are)g(used)h(to)g(create)f(a)h(tree)g
(structure)f(of)h(the)h(enco)r(ded)f(\014le)g(\(see)g(Figure)p
-1 0 0 TeXcolorrgb 3308 3032 a
+1 0 0 TeXcolorrgb 3308 2691 a
SDict begin H.S end
- 3308 3032 a 1 0 0 TeXcolorrgb
-FA(1)p 1 0 0 TeXcolorrgb 3350 2979 a
+ 3308 2691 a 1 0 0 TeXcolorrgb
+Fx(1)p 1 0 0 TeXcolorrgb 3350 2637 a
SDict begin H.R end
- 3350 2979 a 3350
-3032 a
+ 3350 2637 a 3350
+2691 a
SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(figure.1.1) cvn H.B /ANN pdfmark end
- 3350 3032 a Black FA(\).)523 3132 y(The)39 b(actual)f(\014le)g
-(data)g(is)g(enco)r(ded)h(in)g Ft(DBlo)l(cks)g FA(whic)n(h)f(are)g
-(organized)f(b)n(y)h(a)g(tree)g(of)523 3232 y Ft(IBlo)l(cks)p
-FA(.)j(The)f Ft(IBlo)l(cks)p FA(,)h(whic)n(h)e(are)g(similar)f(to)i
-(UNIX)g(ino)r(des)g([)p 0 1 0 TeXcolorrgb 2698 3232 a
+ 3350 2691 a Black Fx(\).)523 2790 y(The)39 b(actual)f(\014le)g
+(data)g(is)g(enco)r(ded)h(in)g Fq(DBlo)l(cks)g Fx(whic)n(h)f(are)g
+(organized)f(b)n(y)h(a)g(tree)g(of)523 2890 y Fq(IBlo)l(cks)p
+Fx(.)j(The)f Fq(IBlo)l(cks)p Fx(,)h(whic)n(h)e(are)g(similar)f(to)i
+(UNIX)g(ino)r(des)g([)p 0 1 0 TeXcolorrgb 2698 2890 a
SDict begin H.S end
-2698 3232 a 0 1 0 TeXcolorrgb FA(21)p 0 1 0 TeXcolorrgb
-2781 3178 a
+2698 2890 a 0 1 0 TeXcolorrgb Fx(19)p 0 1 0 TeXcolorrgb
+2781 2836 a
SDict begin H.R end
- 2781 3178 a 2781 3232 a
+ 2781 2836 a 2781 2890 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.mckusick84fast) cvn H.B /ANN pdfmark end
- 2781 3232 a Black
-FA(],)g(are)e(indirection)523 3331 y(blo)r(c)n(ks)27
+ 2781 2890 a Black
+Fx(],)g(are)e(indirection)523 2990 y(blo)r(c)n(ks)27
b(whic)n(h)h(enco)r(de)f(ho)n(w)g(the)h(leaf)g(no)r(des)f(of)h(the)g
(tree)g(can)f(b)r(e)h(reassem)n(bled)e(in)n(to)i(the)523
-3431 y(original)35 b(\014le.)h(Ev)n(ery)f Ft(IBlo)l(ck)j
-FA(pro)n(vides)d(the)i(data)f(required)f(to)h(request,)g(decrypt)g(and)
-523 3531 y(v)n(erify)c(the)h(con)n(ten)n(ts)f(of)h(its)g(direct)g(c)n
+3089 y(original)35 b(\014le.)h(Ev)n(ery)f Fq(IBlo)l(ck)j
+Fx(pro)n(vides)d(the)i(data)f(required)f(to)h(request,)g(decrypt)g(and)
+523 3189 y(v)n(erify)c(the)h(con)n(ten)n(ts)f(of)h(its)g(direct)g(c)n
(hildren.)f(V)-7 b(eri\014cation)32 b(is)h(done)g(using)f(hash)g(co)r
-(des)523 3630 y(of)h(the)h(c)n(hildren,)f(similar)f(to)h(the)h(w)n(a)n
-(y)d(a)i(Merkle)g(tree)g([)p 0 1 0 TeXcolorrgb 2377 3630
+(des)523 3288 y(of)h(the)h(c)n(hildren,)f(similar)f(to)h(the)h(w)n(a)n
+(y)d(a)i(Merkle)g(tree)g([)p 0 1 0 TeXcolorrgb 2377 3288
a
SDict begin H.S end
- 2377 3630 a 0 1 0 TeXcolorrgb FA(22)p 0 1 0 TeXcolorrgb
-2460 3577 a
+ 2377 3288 a 0 1 0 TeXcolorrgb Fx(20)p 0 1 0 TeXcolorrgb
+2460 3235 a
SDict begin H.R end
- 2460 3577 a 2460 3630 a
+ 2460 3235 a 2460 3288 a
SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.merkle89tree) cvn H.B /ANN pdfmark end
- 2460 3630 a Black
-FA(])g(w)n(orks.)f(Giv)n(en)h(the)g(size)g(of)523 3730
-y(the)25 b(\014le,)g(the)g(top)g Ft(IBlo)l(ck)h FA(uniquely)e(iden)n
+ 2460 3288 a Black
+Fx(])g(w)n(orks.)f(Giv)n(en)h(the)g(size)g(of)523 3388
+y(the)25 b(\014le,)g(the)g(top)g Fq(IBlo)l(ck)h Fx(uniquely)e(iden)n
(ti\014es)h(the)g(con)n(ten)n(ts)f(of)h(the)g(en)n(tire)f(\014le.)h
-Ft(KBlo)l(cks)523 3829 y FA(and)32 b Ft(SBlo)l(cks)i
-FA(facilitate)e(obtaining)g(the)g(k)n(ey)g(hash)g(\(to)h(decrypt\))f
-(and)g(query)g(hash)g(\(to)523 3929 y(request\))27 b(for)g(the)h(top)g
-Ft(IBlo)l(ck)p FA(.)523 4090 y
+Fq(KBlo)l(cks)523 3488 y Fx(and)32 b Fq(SBlo)l(cks)i
+Fx(facilitate)e(obtaining)g(the)g(k)n(ey)g(hash)g(\(to)h(decrypt\))f
+(and)g(query)g(hash)g(\(to)523 3587 y(request\))27 b(for)g(the)h(top)g
+Fq(IBlo)l(ck)p Fx(.)523 3768 y
SDict begin H.S end
- 523 4090 a 523 4090 a
+ 523 3768 a 523 3768 a
SDict begin 12 H.A end
-523 4090 a 523 4090 a
+523 3768 a 523 3768 a
SDict begin [ /View [/XYZ H.V] /Dest (subsection.1.3.2) cvn H.B /DEST
pdfmark end
- 523 4090 a 79 x Fr(3.2)95 b Fj(DBlo)-5
-b(cks)523 4327 y FA(Ev)n(ery)33 b Ft(DBlo)l(ck)j FA(corresp)r(onds)c
+ 523 3768 a 81 x Fo(3.2)95 b Fg(DBlo)-5
+b(cks)523 4028 y Fx(Ev)n(ery)33 b Fq(DBlo)l(ck)j Fx(corresp)r(onds)c
(to)j(32Kb)e(of)i(the)g(original)e(\014le)i(\(the)g(last)g(blo)r(c)n(k)
-f(ma)n(y)g(b)r(e)523 4426 y(padded)g(with)g(zeros)e(if)i(the)g(\014le)g
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(end)g(do)r(es)f(not)h(fall)f(on)h(a)f(32Kb)f(b)r(oundary\).)h
-Ft(DBlo)l(ck)p FA(s)523 4526 y(are)d(encrypted)h(using)f(a)h(symmetric)
-f(cipher.)h(F)-7 b(or)30 b(the)i Ft(DBlo)l(ck)f FA(that)h(corresp)r
-(onds)d(to)h(a)523 4625 y(plain)n(text)e(blo)r(c)n(k)f
-Fs(B)1156 4637 y Fi(i)1184 4625 y FA(,)h(the)h(k)n(ey)e(for)g(the)i
-(cipher)f(is)f Fs(K)2204 4637 y Fi(i)2255 4625 y FA(:=)d
-Fs(H)7 b FA(\()p Fs(B)2538 4637 y Fi(i)2565 4625 y FA(\).)29
-b(This)f(guaran)n(tees)e(that)523 4725 y(the)d(same)f(blo)r(c)n(k)g
+Fq(DBlo)l(ck)p Fx(s)523 4227 y(are)d(encrypted)h(using)f(a)h(symmetric)
+f(cipher.)h(F)-7 b(or)30 b(the)i Fq(DBlo)l(ck)f Fx(that)h(corresp)r
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+Fp(B)1156 4339 y Ff(i)1184 4327 y Fx(,)h(the)h(k)n(ey)e(for)g(the)i
+(cipher)f(is)f Fp(K)2204 4339 y Ff(i)2255 4327 y Fx(:=)d
+Fp(H)7 b Fx(\()p Fp(B)2538 4339 y Ff(i)2565 4327 y Fx(\).)29
+b(This)f(guaran)n(tees)e(that)523 4426 y(the)d(same)f(blo)r(c)n(k)g
(will)h(alw)n(a)n(ys)e(b)r(e)i(encrypted)f(with)h(the)g(same)f(k)n(ey)
--7 b(.)22 b(Also,)g(the)h(in)n(tegrit)n(y)f(of)523 4825
+-7 b(.)22 b(Also,)g(the)h(in)n(tegrit)n(y)f(of)523 4526
y(the)g(decrypted)f(blo)r(c)n(k)f(can)h(b)r(e)h(v)n(eri\014ed)e(b)n(y)h
-(c)n(hec)n(king)f(that)i Fs(K)2470 4837 y Fi(i)2520 4825
-y FA(=)h Fs(H)7 b FA(\()p Fs(B)2779 4837 y Fi(i)2806
-4825 y FA(\).)22 b(The)f(encrypted)523 4924 y(blo)r(c)n(k)k
-Fs(E)801 4936 y Fi(K)857 4944 y Fh(i)888 4924 y FA(\()p
-Fs(B)983 4936 y Fi(i)1011 4924 y FA(\))g(can)h(b)r(e)g(uniquely)f(iden)
-n(ti\014ed)h(b)n(y)g(its)f(hash)g Fs(Q)2509 4936 y Fi(i)2560
-4924 y FA(:=)e Fs(H)7 b FA(\()p Fs(E)2840 4936 y Fi(K)2896
-4944 y Fh(i)2926 4924 y FA(\()p Fs(B)3021 4936 y Fi(i)3049
-4924 y FA(\)\).)26 b(A)g(p)r(eer)p Black Black eop end
-%%Page: 10 10
-TeXDict begin 10 9 bop 0 0 a
+(c)n(hec)n(king)f(that)i Fp(K)2470 4538 y Ff(i)2520 4526
+y Fx(=)h Fp(H)7 b Fx(\()p Fp(B)2779 4538 y Ff(i)2806
+4526 y Fx(\).)22 b(The)f(encrypted)523 4625 y(blo)r(c)n(k)k
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+4625 y Fx(:=)e Fp(H)7 b Fx(\()p Fp(E)2840 4637 y Ff(K)2896
+4645 y Fe(i)2926 4625 y Fx(\()p Fp(B)3021 4637 y Ff(i)3049
+4625 y Fx(\)\).)26 b(A)g(p)r(eer)523 4725 y(can)34 b(query)g(for)g
+Fp(E)1115 4737 y Ff(K)1171 4745 y Fe(i)1201 4725 y Fx(\()p
+Fp(B)1296 4737 y Ff(i)1324 4725 y Fx(\))h(using)f(the)h(query)e(hash)h
+Fp(Q)2269 4737 y Ff(i)2331 4725 y Fx(without)h(rev)n(ealing)d
+Fp(K)3075 4737 y Ff(i)3102 4725 y Fx(.)j(Conse-)523 4825
+y(quen)n(tly)-7 b(,)24 b(the)g(pair)f(\()p Fp(K)1242
+4837 y Ff(i)1270 4825 y Fp(;)14 b(Q)1373 4837 y Ff(i)1400
+4825 y Fx(\))24 b(can)f(b)r(e)i(used)e(to)h(retriev)n(e)f(and)g
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+523 4924 y(can)30 b(v)n(erify)h(that)g(a)f(resp)r(onse)g
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SDict begin H.S end
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SDict begin 12 H.A end
- 523 2264 a 523
-2264 a
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SDict begin [ /View [/XYZ H.V] /Dest (subsection.1.3.4) cvn H.B /DEST
pdfmark end
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n(h)h(that)f(the)h(users)f(can)g(obtain)h(the)g(query)523
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(in)j(order)d(to)j(retriev)n(e)e(and)h(decrypt)g(the)523
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(unication)h(of)g(those)g(CHK)g(k)n(eys)f(is)h(cer-)523
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(clearly)f(desirable.)g(Related)h(w)n(ork)f(on)h(secure)523
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SDict begin H.S end
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SDict begin H.R end
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SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
(cite.secure2004goh) cvn H.B /ANN pdfmark end
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-SDict begin [ /Color [1 0 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
-(subsection.1.3.6) cvn H.B /ANN pdfmark end
- 3405 3228 a Black
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f(to)h(the)g(in)n(termediaries,)e(whic)n(h)i(again)523
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-(reasonable)d(in)i(net)n(w)n(orks)f(with)h(limited)h(CPU)523
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-SDict begin H.S end
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232 a
SDict begin H.R end
523 232 a 523 232 a
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- 523 232 a Black Fx(20)199 b(C.)27
+ 523 232 a Black Fu(14)199 b(C.)27
b(Grotho\013,)f(K.)g(Grotho\013,)g(T.)h(Horozo)n(v,)f(J.T.)h(Lindgren)p
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SDict begin [ /Subtype /Link /Dest (Hfootnote.4) cvn /H /I /Border
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- 867 1646
-a Black FA(.)523 1903 y Fr(Ac)m(kno)m(wledgemen)m(ts)523
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SDict begin H.S end
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SDict begin 12 H.A end
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SDict begin [ /View [/XYZ H.V] /Dest (section*.1) cvn H.B /DEST pdfmark
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523
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(helpful)g(commen)n(ts)g(on)g(an)g(earlier)e(draft)i(of)523
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-2559 y
+1829 y(this)j(pap)r(er.)523 2080 y Fr(References)523
+2164 y
SDict begin H.S end
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SDict begin 11 H.A end
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SDict begin [ /View [/XYZ H.V] /Dest (section*.2) cvn H.B /DEST pdfmark
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523
-2559 a 523 2559 a
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SDict begin H.S end
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SDict begin 11 H.A end
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-2559 a
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SDict begin [ /View [/XYZ H.V] /Dest (cite.anderson96eternity) cvn
H.B /DEST pdfmark end
- 523 2559 a Black 561 2652 a Fx(1.)p Black 43 w(Ross)e(Anderson.)
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+2267 y
SDict begin H.S end
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SDict begin 11 H.A end
- 523 2667 a 523 2667 a
-SDict begin [ /View [/XYZ H.V] /Dest (cite.esed) cvn H.B /DEST pdfmark
-end
+ 523 2267 a 523 2267 a
+SDict begin [ /View [/XYZ H.V] /Dest (cite.ecrstechreport) cvn H.B
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523
-2667 a Black 561 2745 a Fx(2.)p Black 43 w(Krista)34
-b(Bennett,)g(Christian)h(Grotho\013,)g(Tzv)n(etan)f(Horozo)n(v,)g(and)g
-(Ioana)h(P)n(atrascu.)60 b(Ef-)663 2836 y(\014cien)n(t)31
-b(Sharing)h(of)h(Encrypted)e(Data.)54 b(In)31 b Fq(ASCIP)p
-Fx(,)h(v)n(olume)g(2384)h(of)g Fq(L)l(e)l(ctur)l(e)j(Notes)e(in)663
-2927 y(Computer)28 b(Scienc)l(e)p Fx(,)f(pages)g(107{120.)i(Springer-V)
--6 b(erlag)25 b(Inc.,)h(2002.)523 2942 y
+2267 a Black 561 2339 a Fu(2.)p Black 43 w(Krista)35
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+(J.)i(T.)f(Lindgren.)62 b(An)663 2431 y(Enco)r(ding)30
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+b(at)663 2522 y(h)n(ttp://gn)n(unet.org/do)n(wnload/ecrs.ps.)523
+2541 y
SDict begin H.S end
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-2942 a
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SDict begin 11 H.A end
- 523 2942 a 523 2942 a
-SDict begin [ /View [/XYZ H.V] /Dest (cite.bloom) cvn H.B /DEST pdfmark
+ 523 2541 a 523 2541 a
+SDict begin [ /View [/XYZ H.V] /Dest (cite.esed) cvn H.B /DEST pdfmark
end
- 523 2942 a Black 561 3020
-a Fx(3.)p Black 43 w(Burton)g(Blo)r(om.)37 b(Space/time)26
-b(trade-o\013s)g(in)g(hash)g(co)r(ding)h(with)f(allo)n(w)n(able)i
-(errors.)37 b Fq(Com-)663 3112 y(munic)l(ations)28 b(of)f(the)i(A)n(CM)
-p Fx(,)c(13\(7\):422{426,)30 b(1970.)523 3130 y
+ 523
+2541 a Black 561 2610 a Fu(3.)p Black 43 w(Krista)i(Bennett,)g
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+b(erlag)25 b(Inc.,)h(2002.)523 2807 y
SDict begin H.S end
- 523 3130
-a 523 3130 a
+ 523 2807 a 523
+2807 a
SDict begin 11 H.A end
- 523 3130 a 523 3130 a
+ 523 2807 a 523 2807 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.chen99prototype) cvn H.B
/DEST pdfmark end
- 523 3130 a Black 561
-3205 a Fx(4.)p Black 43 w(Y)-6 b(uan)19 b(Chen,)i(Jan)h(Edler,)f
-(Andrew)g(Goldb)r(erg,)h(Allan)f(Gottlieb,)h(Sumeet)e(Sobti,)h(and)g(P)
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-y(the)d(F)-6 b(ourth)29 b(A)n(CM)e(International)i(Confer)l(enc)l(e)g
-(on)f(Digital)f(Libr)l(aries)p Fx(,)g(1999.)523 3402
-y
+ 523 2807 a Black 561 2880
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- 523 3402 a 523 3402 a
+ 523 3078 a 523 3078 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.clark99distributed) cvn
H.B /DEST pdfmark end
- 523 3402
-a Black 561 3480 a Fx(5.)p Black 43 w(Ian)h(Clark)n(e,)h(Osk)l(ar)g
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-(Hong.)43 b(F)-6 b(reenet:)663 3572 y(A)35 b(distributed)f(anon)n
-(ymous)i(information)g(storage)h(and)e(retriev)l(al)h(system.)63
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(A)n(nonymity)g(and)h(Unobservability,)g(Berkeley,)g(CA,)e(USA,)663
-3846 y(July)25 b(25{26,)g(2000:)g(pr)l(o)l(c)l(e)l(e)l(dings)p
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-(Computer)h(Scienc)l(e)p Fx(.)663 3937 y(Springer-V)-6
-b(erlag)25 b(Inc.,)h(2001.)523 3952 y
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+b(erlag)25 b(Inc.,)h(2001.)523 3622 y
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+ 523 3622 a 523 3622 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.cohen02replication) cvn
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- 523 3952 a Black 561 4030
-a Fx(6.)p Black 43 w(Edith)31 b(Cohen)g(and)g(Scott)g(Shenk)n(er.)50
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b(Replication)31 b(strategies)i(in)e(unstructured)f(p)r(eer-to-)663
-4121 y(p)r(eer)25 b(net)n(w)n(orks.)35 b(In)25 b Fq(The)j(A)n(CM)f
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SDict begin H.S end
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SDict begin 11 H.A end
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SDict begin [ /View [/XYZ H.V] /Dest (cite.cfs:sosp01) cvn H.B /DEST
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523
-4136 a Black 561 4215 a Fx(7.)p Black 43 w(F)-6 b(rank)26
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b(Dab)r(ek,)i(M.)g(F)-6 b(rans)27 b(Kaasho)r(ek,)h(Da)n(vid)f(Karger,)h
-(Rob)r(ert)g(Morris,)h(and)e(Ion)g(Stoica.)663 4306 y(Wide-area)j(co)r
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(op)r(erativ)n(e)h(storage)g(with)e(CFS.)47 b(In)28 b
-Fq(Pr)l(o)l(c)l(e)l(e)l(dings)34 b(of)d(the)h(18th)g(A)n(CM)e(Sym-)663
-4397 y(p)l(osium)25 b(on)g(Op)l(er)l(ating)h(Systems)g(Principles)f
-(\(SOSP)g('01\))p Fx(,)f(Chateau)f(Lak)n(e)g(Louise,)g(Ban\013,)663
-4489 y(Canada,)k(Octob)r(er)e(2001.)523 4504 y
+Fn(Pr)l(o)l(c)l(e)l(e)l(dings)34 b(of)d(the)h(18th)g(A)n(CM)e(Sym-)663
+4056 y(p)l(osium)25 b(on)g(Op)l(er)l(ating)h(Systems)g(Principles)f
+(\(SOSP)g('01\))p Fu(,)f(Chateau)f(Lak)n(e)g(Louise,)g(Ban\013,)663
+4147 y(Canada,)k(Octob)r(er)e(2001.)523 4162 y
SDict begin H.S end
- 523 4504
-a 523 4504 a
+ 523 4162
+a 523 4162 a
SDict begin 11 H.A end
- 523 4504 a 523 4504 a
+ 523 4162 a 523 4162 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.dingledine02mixminion) cvn
H.B /DEST pdfmark end
- 523 4504 a Black 561
-4582 a Fx(8.)p Black 43 w(George)32 b(Danezis,)g(Roger)g(Dingledine,)g
+ 523 4162 a Black 561
+4235 a Fu(8.)p Black 43 w(George)32 b(Danezis,)g(Roger)g(Dingledine,)g
(and)f(Nic)n(k)f(Mathewson.)52 b(Mixminion:)32 b(Design)g(of)663
-4673 y(a)d(T)n(yp)r(e)f(I)r(I)r(I)g(Anon)n(ymous)g(Remailer)i(Proto)r
-(col.)45 b(In)28 b Fq(IEEE)i(Symp)l(osium)h(on)g(Se)l(curity)g(and)663
-4764 y(Privacy)p Fx(,)c(2003.)p Black 523 4839 473 4
-v 546 4893 a Fy(4)p 0 TeXcolorgray 606 4833 a
+4326 y(a)d(T)n(yp)r(e)f(I)r(I)r(I)g(Anon)n(ymous)g(Remailer)i(Proto)r
+(col.)45 b(In)28 b Fn(IEEE)i(Symp)l(osium)h(on)g(Se)l(curity)g(and)663
+4417 y(Privacy)p Fu(,)c(2003.)523 4432 y
SDict begin H.S end
- 606 4833
-a 0 TeXcolorgray 0 TeXcolorgray 606 4833 a
-SDict begin H.R end
- 606 4833 a
+ 523 4432 a 523
+4432 a
+SDict begin 11 H.A end
+ 523 4432 a 523 4432 a
+SDict begin [ /View [/XYZ H.V] /Dest (cite.freehaven-berk) cvn H.B
+/DEST pdfmark end
+ 523 4432 a Black 561 4505
+a Fu(9.)p Black 43 w(Roger)18 b(Dingledine,)h(Mic)n(hael)g(J.)g(F)-6
+b(reedman,)18 b(and)g(Da)n(vid)f(Molnar.)23 b(The)c(free)f(ha)n(v)n(en)
+g(pro)t(ject:)663 4596 y(Distributed)37 b(anon)n(ymous)i(storage)g
+(service.)73 b(In)38 b(Hannes)g(F)-6 b(ederrath,)38 b(editor,)h
+Fn(Pr)l(o)l(c)l(e)l(e)l(d-)663 4687 y(ings)26 b(of)g(Designing)g
+(Privacy)h(Enhancing)g(T)-6 b(e)l(chnolo)l(gies:)27 b(Workshop)g(on)g
+(Design)f(Issues)h(in)663 4779 y(A)n(nonymity)h(and)g(Unobservability)p
+Fu(.)g(Springer-V)-6 b(erlag,)26 b(LNCS)f(2009,)i(July)f(2000.)p
+Black 523 4839 473 4 v 546 4893 a Fv(4)p 0 TeXcolorgray
606 4833 a
+SDict begin H.S end
+ 606 4833 a 0 TeXcolorgray 0 TeXcolorgray 606
+4833 a
+SDict begin H.R end
+ 606 4833 a 606 4833 a
SDict begin [ /View [/XYZ H.V] /Dest (Hfootnote.4) cvn H.B /DEST pdfmark
end
- 606 4833 a Black 0 1 0 0 TeXcolorcmyk 606
-4941 a
+ 606 4833 a Black 0 1 0 0
+TeXcolorcmyk 606 4941 a
SDict begin H.S end
- 606 4941 a 0 1 0 0 TeXcolorcmyk -17 x Fw(http://gnunet.org/)p
-0 1 0 0 TeXcolorcmyk 1312 4872 a
+ 606 4941 a 0 1 0 0 TeXcolorcmyk
+-17 x Ft(http://gnunet.org/)p 0 1 0 0 TeXcolorcmyk 1312
+4872 a
SDict begin H.R end
- 1312 4872 a 1312 4924
-a
+ 1312 4872 a 1312 4924 a
SDict begin [ /H /I /Border [0 0 0] /Color [0 1 1] /Action << /Subtype
/URI /URI (http://gnunet.org/) >> /Subtype /Link H.B /ANN pdfmark end
- 1312 4924 a Black Black Black Black eop end
-%%Page: 21 21
-TeXDict begin 21 20 bop 0 0 a
+ 1312 4924 a Black Black
+Black Black eop end
+%%Page: 15 15
+TeXDict begin 15 14 bop 0 0 a
SDict begin /product where{pop product(Distiller)search{pop pop pop
version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto
closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show
@@ -9220,276 +7683,273 @@
232 a
SDict begin H.R end
523 232 a 523 232 a
-SDict begin [ /View [/XYZ H.V] /Dest (page.21) cvn H.B /DEST pdfmark
+SDict begin [ /View [/XYZ H.V] /Dest (page.15) cvn H.B /DEST pdfmark
end
- 523 232 a Black 1036 w Fx(An)25
+ 523 232 a Black 1036 w Fu(An)25
b(Enco)r(ding)h(for)h(Censorship-Resistan)n(t)f(Sharing)199
-b(21)p Black 523 365 a
+b(15)p Black 523 365 a
SDict begin H.S end
523 365 a 523 365 a
SDict begin 11 H.A end
523 365 a
523 365 a
-SDict begin [ /View [/XYZ H.V] /Dest (cite.freehaven-berk) cvn H.B
-/DEST pdfmark end
- 523 365 a Black 561 448 a Fx(9.)p Black 43
-w(Roger)18 b(Dingledine,)h(Mic)n(hael)g(J.)g(F)-6 b(reedman,)18
-b(and)g(Da)n(vid)f(Molnar.)23 b(The)c(free)f(ha)n(v)n(en)g(pro)t(ject:)
-663 540 y(Distributed)37 b(anon)n(ymous)i(storage)g(service.)73
-b(In)38 b(Hannes)g(F)-6 b(ederrath,)38 b(editor,)h Fq(Pr)l(o)l(c)l(e)l
-(e)l(d-)663 631 y(ings)26 b(of)g(Designing)g(Privacy)h(Enhancing)g(T)-6
-b(e)l(chnolo)l(gies:)27 b(Workshop)g(on)g(Design)f(Issues)h(in)663
-722 y(A)n(nonymity)h(and)g(Unobservability)p Fx(.)g(Springer-V)-6
-b(erlag,)26 b(LNCS)f(2009,)i(July)f(2000.)523 737 y
-SDict begin H.S end
- 523
-737 a 523 737 a
-SDict begin 11 H.A end
- 523 737 a 523 737 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.farsite) cvn H.B /DEST pdfmark
end
- 523 737 a Black 72
-x Fx(10.)p Black 43 w(John)19 b(R.)f(Douceur,)h(A)n(tul)f(Ady)n(a,)h
-(Wiliam)h(J.)g(Bolosky)-6 b(,)19 b(Dan)g(Simon,)g(and)g(Marvin)g
-(Theimer.)663 900 y(Reclaiming)26 b(space)g(from)g(duplicate)f(\014les)
-g(in)g(a)h(serv)n(erless)g(distributed)f(\014le)g(system.)33
-b(T)-6 b(ec)n(h-)663 992 y(nical)26 b(rep)r(ort,)g(Microsoft)i(Researc)
-n(h,)e(2002.)523 1007 y
+ 523 365 a Black 83 x Fu(10.)p Black 43 w(John)19
+b(R.)f(Douceur,)h(A)n(tul)f(Ady)n(a,)h(Wiliam)h(J.)g(Bolosky)-6
+b(,)19 b(Dan)g(Simon,)g(and)g(Marvin)g(Theimer.)663 540
+y(Reclaiming)26 b(space)g(from)g(duplicate)f(\014les)g(in)g(a)h(serv)n
+(erless)g(distributed)f(\014le)g(system.)33 b(T)-6 b(ec)n(h-)663
+631 y(nical)26 b(rep)r(ort,)g(Microsoft)i(Researc)n(h,)e(2002.)523
+646 y
SDict begin H.S end
- 523 1007 a 523 1007 a
+ 523 646 a 523 646 a
SDict begin 11 H.A end
- 523 1007
-a 523 1007 a
-SDict begin [ /View [/XYZ H.V] /Dest (cite.feamster-infranet) cvn H.B
-/DEST pdfmark end
- 523 1007 a Black 71 x Fx(11.)p Black 43
-w(Nic)n(k)21 b(F)-6 b(eamster,)23 b(Magdalena)g(Balazinsk)l(a,)h(Greg)f
-(Harfst,)g(Hari)f(Balakrishnan,)h(and)e(Da)n(vid)663
-1169 y(Karger.)k(Infranet:)20 b(Circum)n(v)n(en)n(ting)g(w)n(eb)g
-(censorship)g(and)f(surv)n(eillance.)26 b(In)19 b Fq(11th)k(USENIX)663
-1261 y(Se)l(curity)29 b(Symp)l(osium)p Fx(,)d(2002.)523
-1276 y
-SDict begin H.S end
- 523 1276 a 523 1276 a
-SDict begin 11 H.A end
- 523 1276 a 523 1276 a
+ 523 646 a 523 646 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.secure2004goh) cvn H.B /DEST
pdfmark end
- 523
-1276 a Black 71 x Fx(12.)p Black 43 w(Eu-Jin)f(Goh.)35
-b(Secure)25 b(indexes.)35 b(In)25 b Fq(Cryptolo)l(gy)k(ePrint)f(A)n(r)l
-(chive)p Fx(,)f(Oct)e(2003.)523 1362 y
+ 523 646
+a Black 76 x Fu(11.)p Black 43 w(Eu-Jin)f(Goh.)35 b(Secure)25
+b(indexes.)35 b(In)25 b Fn(Cryptolo)l(gy)k(ePrint)f(A)n(r)l(chive)p
+Fu(,)f(Oct)e(2003.)523 737 y
SDict begin H.S end
- 523 1362 a 523
-1362 a
+ 523 737 a 523 737 a
SDict begin 11 H.A end
- 523 1362 a 523 1362 a
+ 523
+737 a 523 737 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.ebe2003) cvn H.B /DEST pdfmark
end
- 523 1362 a Black 72 x Fx(13.)p
-Black 43 w(Christian)i(Grotho\013.)35 b(An)25 b(Excess-Based)i
-(Economic)g(Mo)r(del)g(for)f(Resource)h(Allo)r(cation)g(in)663
-1525 y(P)n(eer-to-P)n(eer)f(Net)n(w)n(orks.)34 b Fq
-(Wirtschaftsinformatik)p Fx(,)27 b(3-2003,)h(June)d(2003.)523
-1540 y
+ 523 737 a Black 77 x Fu(12.)p Black 43
+w(Christian)i(Grotho\013.)35 b(An)25 b(Excess-Based)i(Economic)g(Mo)r
+(del)g(for)f(Resource)h(Allo)r(cation)g(in)663 905 y(P)n(eer-to-P)n
+(eer)f(Net)n(w)n(orks.)34 b Fn(Wirtschaftsinformatik)p
+Fu(,)27 b(3-2003,)h(June)d(2003.)523 920 y
SDict begin H.S end
- 523 1540 a 523 1540 a
+ 523 920 a
+523 920 a
SDict begin 11 H.A end
- 523 1540 a 523 1540 a
-SDict begin [ /View [/XYZ H.V] /Dest (cite.le2005) cvn H.B /DEST pdfmark
-end
- 523
-1540 a Black 72 x Fx(14.)p Black 43 w(Christian)33 b(Grotho\013.)55
-b(Reading)32 b(File)i(Metadata)f(with)g(extract)f(and)g(lib)r
-(extractor.)56 b Fq(Lin-)663 1703 y(uxJournal)p Fx(,)27
-b(6-2005,)h(June)d(2005.)523 1718 y
-SDict begin H.S end
- 523 1718 a 523 1718
-a
-SDict begin 11 H.A end
- 523 1718 a 523 1718 a
+ 523 920 a 523 920 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.hartman99swarm) cvn H.B
/DEST pdfmark end
- 523 1718 a Black 72 x Fx(15.)p
+ 523 920 a Black 76 x Fu(13.)p
Black 43 w(John)d(H.)g(Hartman,)h(Ian)f(Murdo)r(c)n(k,)h(and)f(T)-6
b(ammo)23 b(Spalink.)28 b(The)23 b(sw)n(arm)g(scalable)h(storage)663
-1881 y(system.)67 b(In)36 b Fq(International)j(Confer)l(enc)l(e)g(on)f
-(Distribute)l(d)h(Computing)f(Systems)p Fx(,)h(pages)663
-1972 y(74{81,)28 b(1999.)523 1987 y
+1088 y(system.)67 b(In)36 b Fn(International)j(Confer)l(enc)l(e)g(on)f
+(Distribute)l(d)h(Computing)f(Systems)p Fu(,)h(pages)663
+1179 y(74{81,)28 b(1999.)523 1194 y
SDict begin H.S end
- 523 1987 a 523 1987
+ 523 1194 a 523 1194
a
SDict begin 11 H.A end
- 523 1987 a 523 1987 a
+ 523 1194 a 523 1194 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.herlihy87how) cvn H.B /DEST
pdfmark end
- 523 1987 a Black 72 x Fx(16.)p
+ 523 1194 a Black 76 x Fu(14.)p
Black 43 w(Maurice)42 b(Herlih)n(y)e(and)h(J.)h(D.)f(T)n(ygar.)81
b(Ho)n(w)42 b(to)f(mak)n(e)g(replicated)h(data)g(secure.)81
-b(In)663 2150 y Fq(CR)-6 b(YPTO)p Fx(,)25 b(pages)i(379{391,)i(1987.)
-523 2165 y
+b(In)663 1362 y Fn(CR)-6 b(YPTO)p Fu(,)25 b(pages)i(379{391,)i(1987.)
+523 1377 y
SDict begin H.S end
- 523 2165 a 523 2165 a
+ 523 1377 a 523 1377 a
SDict begin 11 H.A end
- 523 2165 a 523 2165
+ 523 1377 a 523 1377
a
SDict begin [ /View [/XYZ H.V] /Dest (cite.levien03advogato) cvn H.B
/DEST pdfmark end
- 523 2165 a Black 72 x Fx(17.)p Black 43 w(Raph)76 b(Levien.)189
+ 523 1377 a Black 76 x Fu(15.)p Black 43 w(Raph)76 b(Levien.)189
b(A)n(ttac)n(k)77 b(resistan)n(t)h(trust)f(metrics.)190
-b(Draft)78 b(a)n(v)l(ailable)h(at)663 2328 y(h)n
+b(Draft)78 b(a)n(v)l(ailable)h(at)663 1545 y(h)n
(ttp://www.levien.com/thesis/compact.p)r(df,)31 b(2003.)523
-2347 y
+1563 y
SDict begin H.S end
- 523 2347 a 523 2347 a
+ 523 1563 a 523 1563 a
SDict begin 11 H.A end
- 523 2347 a 523 2347 a
+ 523 1563 a 523 1563 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.maymounkov02kademlia) cvn
H.B /DEST pdfmark end
523
-2347 a Black 68 x Fx(18.)p Black 43 w(P)n(etar)h(Ma)n(ymounk)n(o)n(v)f
+1563 a Black 73 x Fu(16.)p Black 43 w(P)n(etar)h(Ma)n(ymounk)n(o)n(v)f
(and)h(Da)n(vid)f(Mazi)n(\022)-36 b(eres.)56 b(Kademlia:)33
-b(A)f(p)r(eer-to-p)r(eer)f(information)663 2506 y(system)f(based)g(on)g
-(the)g(xor)g(metric.)48 b(In)29 b Fq(Pr)l(o)l(c)l(e)l(e)l(dings)34
-b(of)d(IPTPS02,)g(Cambridge)p Fx(,)g(Marc)n(h)663 2597
-y(2002.)523 2597 y
+b(A)f(p)r(eer-to-p)r(eer)f(information)663 1727 y(system)f(based)g(on)g
+(the)g(xor)g(metric.)48 b(In)29 b Fn(Pr)l(o)l(c)l(e)l(e)l(dings)34
+b(of)d(IPTPS02,)g(Cambridge)p Fu(,)g(Marc)n(h)663 1819
+y(2002.)523 1819 y
SDict begin H.S end
- 523 2597 a 523 2597 a
+ 523 1819 a 523 1819 a
SDict begin 11 H.A end
- 523 2597 a 523
-2597 a
+ 523 1819 a 523
+1819 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.mazires00sfs) cvn H.B /DEST
pdfmark end
- 523 2597 a Black 87 x Fx(19.)p Black 43 w(Da)n(vid)25
-b(Mazi)n(\022)-36 b(eres.)36 b Fq(Self-c)l(ertifying)28
-b(\014le)g(system)p Fx(.)35 b(PhD)26 b(thesis,)g(MIT,)h(2000.)523
-2699 y
+ 523 1819 a Black 91 x Fu(17.)p Black 43 w(Da)n(vid)25
+b(Mazi)n(\022)-36 b(eres.)36 b Fn(Self-c)l(ertifying)28
+b(\014le)g(system)p Fu(.)35 b(PhD)26 b(thesis,)g(MIT,)h(2000.)523
+1925 y
SDict begin H.S end
- 523 2699 a 523 2699 a
+ 523 1925 a 523 1925 a
SDict begin 11 H.A end
- 523 2699 a 523 2699 a
+ 523 1925 a 523 1925 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.mazieres02building) cvn
H.B /DEST pdfmark end
523
-2699 a Black 72 x Fx(20.)p Black 43 w(Da)n(vid)e(Mazi)n(\022)-36
+1925 a Black 76 x Fu(18.)p Black 43 w(Da)n(vid)e(Mazi)n(\022)-36
b(eres)28 b(and)e(Dennis)g(Shasha.)36 b(Building)27 b(secure)g(\014le)f
-(systems)h(out)f(of)h(b)n(yzan)n(tine)663 2862 y(storage.)66
-b(In)35 b Fq(Pr)l(o)l(c)l(e)l(e)l(dings)k(of)d(the)i(Twenty-First)h(A)n
-(CM)d(Symp)l(osium)h(on)g(Principles)g(of)663 2953 y(Distribute)l(d)29
-b(Computing)f(\(PODC)f(2002\))p Fx(,)g(2002.)523 2972
+(systems)h(out)f(of)h(b)n(yzan)n(tine)663 2093 y(storage.)66
+b(In)35 b Fn(Pr)l(o)l(c)l(e)l(e)l(dings)k(of)d(the)i(Twenty-First)h(A)n
+(CM)d(Symp)l(osium)h(on)g(Principles)g(of)663 2184 y(Distribute)l(d)29
+b(Computing)f(\(PODC)f(2002\))p Fu(,)g(2002.)523 2203
y
SDict begin H.S end
- 523 2972 a 523 2972 a
+ 523 2203 a 523 2203 a
SDict begin 11 H.A end
- 523 2972 a 523 2972 a
+ 523 2203 a 523 2203 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.mckusick84fast) cvn H.B
/DEST pdfmark end
- 523 2972
-a Black 68 x Fx(21.)p Black 43 w(Marshall)e(K.)f(McKusic)n(k,)g
+ 523 2203
+a Black 72 x Fu(19.)p Black 43 w(Marshall)e(K.)f(McKusic)n(k,)g
(William)i(N.)d(Jo)n(y)-6 b(,)24 b(Sam)n(uel)g(J.)h(Le\017er,)f(and)g
-(Rob)r(ert)f(S.)h(F)-6 b(abry)g(.)30 b(A)663 3131 y(fast)c(\014le)g
-(system)g(for)g(UNIX.)33 b Fq(Computer)c(Systems)p Fx(,)e
-(2\(3\):181{197,)j(1984.)523 3150 y
+(Rob)r(ert)f(S.)h(F)-6 b(abry)g(.)30 b(A)663 2367 y(fast)c(\014le)g
+(system)g(for)g(UNIX.)33 b Fn(Computer)c(Systems)p Fu(,)e
+(2\(3\):181{197,)j(1984.)523 2385 y
SDict begin H.S end
- 523 3150 a 523 3150
+ 523 2385 a 523 2385
a
SDict begin 11 H.A end
- 523 3150 a 523 3150 a
+ 523 2385 a 523 2385 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.merkle89tree) cvn H.B /DEST
pdfmark end
- 523 3150 a Black 68 x Fx(22.)p
+ 523 2385 a Black 73 x Fu(20.)p
Black 43 w(Ralph)e(C.)i(Merkle.)45 b(A)28 b(certi\014ed)h(digital)h
-(signature.)45 b(In)28 b Fq(G.)j(Br)l(assar)l(d,)h(e)l(ditor,)f(A)l
-(dvanc)l(es)663 3309 y(in)e(Cryptolo)l(gy|CR)-6 b(YPTO)32
-b('89)p Fx(,)d(pages)g(218{238.)j(Springer-V)-6 b(erlag,)29
-b(1990.)44 b(v)n(olume)29 b(435)663 3400 y(of)d(Lecture)g(Notes)g(in)f
-(Computer)h(Science.)523 3415 y
+(signature.)45 b(In)28 b Fn(G.)j(Br)l(assar)l(d,)h(e)l(ditor,)f(A)l
+(dvanc)l(es)663 2549 y(in)e(Cryptolo)l(gy|CR)-6 b(YPTO)32
+b('89)p Fu(,)d(pages)g(218{238.)j(Springer-V)-6 b(erlag,)29
+b(1990.)44 b(v)n(olume)29 b(435)663 2641 y(of)d(Lecture)g(Notes)g(in)f
+(Computer)h(Science.)523 2656 y
SDict begin H.S end
- 523 3415 a 523 3415 a
+ 523 2656 a 523 2656 a
SDict begin 11 H.A end
-523 3415 a 523 3415 a
+523 2656 a 523 2656 a
SDict begin [ /View [/XYZ H.V] /Dest (cite.muthitacharoen02ivy) cvn
H.B /DEST pdfmark end
- 523 3415 a Black 72 x Fx(23.)p
+ 523 2656 a Black 76 x Fu(21.)p
Black 43 w(A)n(thic)n(ha)21 b(Muthitac)n(haro)r(en,)i(Rob)r(ert)f
(Morris,)i(Thomer)f(M.)f(Gil,)i(and)d(Benjie)j(Chen.)k(Ivy:)21
-b(A)663 3578 y(read/write)i(p)r(eer-to-p)r(eer)e(\014le)g(system.)28
-b(In)21 b Fq(Pr)l(o)l(c)l(e)l(e)l(dings)26 b(of)d(5th)i(Symp)l(osium)f
-(on)g(Op)l(er)l(ating)663 3670 y(Systems)29 b(Design)f(and)g
-(Implementation)p Fx(,)e(2002.)523 3685 y
+b(A)663 2823 y(read/write)i(p)r(eer-to-p)r(eer)e(\014le)g(system.)28
+b(In)21 b Fn(Pr)l(o)l(c)l(e)l(e)l(dings)26 b(of)d(5th)i(Symp)l(osium)f
+(on)g(Op)l(er)l(ating)663 2915 y(Systems)29 b(Design)f(and)g
+(Implementation)p Fu(,)e(2002.)523 2930 y
SDict begin H.S end
- 523 3685 a
-523 3685 a
+ 523 2930 a
+523 2930 a
SDict begin 11 H.A end
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SDict begin 11 H.A end
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y
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end
%%Trailer
Modified: GNUnet-docs/papers/ecrs/main.tex
===================================================================
--- GNUnet-docs/papers/ecrs/main.tex 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet-docs/papers/ecrs/main.tex 2006-10-23 22:24:56 UTC (rev 3547)
@@ -267,15 +267,14 @@
The rest of the paper is organized as follows. Section~\ref{related}
contrasts the current work with mechanisms used in other
censorship-resistant systems. Section~\ref{content} describes the
-ECRS encoding scheme in detail. Section~\ref{extensions} lists some
-extensions to the basic scheme. Finally, Section~\ref{discussion}
+ECRS encoding scheme in detail. Finally, Section~\ref{discussion}
discusses attacks on ECRS and contrasts it with previous work.
% previous version
-This work builds on our earlier paper~\cite{esed} which was first
-published at ACISP 2001. Since then, the encoding scheme has been
-revised to address additional requirements an to improve the security
-in various aspects. This paper reflects these changes.
+%This work builds on our earlier paper~\cite{esed} which was first
+%published at ACISP 2001. Since then, the encoding scheme has been
+%revised to address additional requirements an to improve the security
+%in various aspects. This paper reflects these changes.
@@ -283,7 +282,7 @@
A large number of censorship-resistant (or at least
fault-tolerant) publishing systems have been proposed in recent years
-\cite{anderson96eternity,chen99prototype,clark99distributed,freehaven-berk,feamster-infranet,herlihy87how,waldman2001tangler,pub00}.
+\cite{anderson96eternity,chen99prototype,clark99distributed,herlihy87how,waldman2001tangler,pub00}.
The proposed protocols differ in various aspects unrelated to the
specifics of the encoding mechanism, such as content replication and the use of
anonymous or steganographic communication. Characteristic of all of
@@ -349,64 +348,6 @@
censorship by intermediaries easier.
-\subsection{Free Haven}
-
-In Free Haven~\cite{freehaven-berk}, documents are split into $n$
-shares which are distributed over a number of servers. Any $k$ out of
-$n$ shares are sufficient to reconstruct the entire
-document~\cite{rabin89efficient}. To retrieve a document, the user
-must obtain the key that was used to sign the document from some
-source outside the Free Haven network. The design of Free Haven
-itself does not discuss any search functionality. The user then
-forwards the key to the server which encrypts and sends its share of
-the document.
-
-Shares are encoded with an information dispersal algorithm (IDA).
-Hosts are still able to exercise editorial control over the content
-since the IDA does not prevent hosts from decoding parts of the
-plaintext. Also, the $k$ out of $n$ share reconstruction scheme does
-not allow reconstruction of a file by mixing shares from independent
-insertions with different values for $k$ or $n$.
-
-
-\subsection{Mnet and Mojo Nation}
-
-Mnet is the successor of Mojo Nation~\cite{mojotech}, a peer-to-peer
-network that was the first to focus on using economic incentives when
-trading content. As the descendant of a commercial product, Mnet
-focuses mostly on efficiency and reliability. Nevertheless, Mnet
-encrypts files with AES using a user-supplied key to allow for
-privacy. The file is then broken into shares using an erasure code.
-Multiple shares are identified with an SHA-1 hash and stored in an
-inode. The file can be retrieved using the hash of the inode and the
-symmetric encryption key.
-
-The use of whole-file AES encryption and the use of an erasure code
-forces Mnet, as with Freenet, to store a second copy of the entire
-file in the Mnet data store even if the user retains a copy of the
-file in plaintext. The encoding makes it infeasible to encode parts
-of the file on request. The free selection of the AES key allows
-independent users to create completely different shares for identical
-files. Since the encryption of the content is a perfectly independent
-pass over the file, other encodings such as ECRS and Freenet's
-encoding could be easily extended to include this behavior if desired
--- without the need to mandate a certain style of AES encryption.
-
-
-\subsection{Publius}
-
-Publius~\cite{pub00} is a static network that uses Shamir's
-algorithm~\cite{shamir} to split the key required to restore stored
-files between the available servers. The encrypted file is then
-stored on all servers. The servers cannot decrypt the file as the key
-is never revealed to them.
-
-Publius keys are random strings. The system does not provide any
-search mechanism and expects the users to obtain the keys from an
-alternate source. Publius never discards any content and thus assumes
-that disk space is never a limitation.
-
-
\subsection{Tangler}
The Tangler network~\cite{waldman2001tangler} is a system where new
@@ -423,19 +364,19 @@
system after the censorship operation.
Tangler has some similarities with ECRS. In particular, it uses hash
-trees for integrity checks on fixed-size blocks of data. However,
+trees for integrity checks on fixed-size blocks of data. However,
unlike ECRS, the Tangler encoding uses Shamir's secret
sharing~\cite{shamir} to entangle the block with other, pre-existing
-blocks, preferably from other documents. Both Tangler and ECRS
-(as well as Freenet) use cryptographically signed data,
-which Tangler calls collections.
-ECRS has analogous constructions to Tangler's collections, referred to
-in this paper as {\em directories} and {\em namespaces}; however, unlike
-ECRS, a Tangler collection has a versioned root which explicitly lists
-all of the contents in the collection, resulting in one of Tangler's
-global synchronization problems. % [FIXME: better w/ CITE].
-Placing a document in a Freenet
-subspace or ECRS namespace only requires that it be adequately signed.
+blocks, preferably from other documents. Both Tangler and ECRS (as
+well as Freenet) use cryptographically signed data, which Tangler
+calls collections. ECRS has analogous constructions to Tangler's
+collections, referred to in our technical report~\cite{ecrstechreport}
+as {\em directories} and {\em namespaces}; however, unlike ECRS, a
+Tangler collection has a versioned root which explicitly lists all of
+the contents in the collection, resulting in one of Tangler's global
+synchronization problems. % [FIXME: better w/ CITE]. Placing a
+document in a Freenet subspace or ECRS namespace only requires that it
+be adequately signed.
\subsection{Gnutella and FastTrack} % what does DirectConnect do?
@@ -479,7 +420,7 @@
Various distributed file systems based on a peer-to-peer
infrastructure have been built in recent
-years~\cite{cfs:sosp01,mazires00sfs,mazieres02building,muthitacharoen02ivy,rowstron01storage}.
+years~\cite{cfs:sosp01,mazieres02building,muthitacharoen02ivy,rowstron01storage}.
These systems typically do not focus on censorship resistance and
consequently do not encrypt the contents. Modern systems
like~\cite{cfs:sosp01,rowstron01storage} route content using
@@ -603,7 +544,7 @@
are encrypted in order to make it impossible for the intermediaries to
determine what they are storing or transmitting. Part~\ref{iblocks}
then describes how files are split into those data blocks.
-Parts~\ref{sec:search} through~\ref{kblocks} motivate and explain how
+Part~\ref{sec:search} motivates and explains how
ECRS enables users to search for content without exposing the
plaintext of the keyword or the corresponding content and how
intermediaries can verify that a given encrypted reply matches the
@@ -696,7 +637,7 @@
integrated solution is clearly desirable. Related work on secure
indexing~\cite{secure2004goh} allows servers to retrieve documents by
keyword without learning about the rest of the document. The scheme
-that will be described in Section~\ref{kblocks} improves on this by
+described in this section improves on this by
keeping the keyword itself private. Additionally, it still allows
intermediaries to verify the correct operation of the server. It also
avoids the need for the publisher to encrypt the document with the
@@ -718,105 +659,9 @@
possibility of returning arbitrary nonsense might make such incentive
schemes impractical.
-But how can a system prevent peers from returning invalid responses to
-a keyword-based search? Since it is inherent in the nature of such a
-search that the initiator does not know precisely what content is
-desired, it is impossible for the query to completely determine the
-reply. For this reason, schemes like CHK cannot be applied to the
-keyword-search problem: in CHK, the query hash completely determines the
-reply. As a result, a keyword-based search mechanism where a query
-should possibly have multiple valid results cannot be implemented
-based on CHK. Since for this kind of search there cannot be any
-completely deterministic link between the keyword and the content,
-ECRS must trust the user who is uploading the content to provide a
-valid link. That user must specify appropriate keywords (and
-metadata) that properly describes the content. Clearly this trust may
-be misplaced. The uploader may specify keywords that have no semantic
-relation with the content. One solution to this problem is the use of
-namespaces, which attack the issue by enabling users to learn which
-uploaders are trustworthy.
+% \subsection{Keyword search} \label{kblocks}
-
-\subsection{Namespaces} \label{sblock}
-
-One way to avoid searching in an untrustworthy global keyword space
-that may contain mostly inappropriately-labeled content is to restrict
-the search to name\-spaces. A name\-space is a keyword space that
-contains content that is cryptographically signed with the same
-private key. The concept of name\-spaces is also present in
-Freenet~\cite{clark99distributed}, but with Freenet it is not possible
-to obtain multiple results by searching a name\-space. Fortunately, it
-is easy to add {\em searchable} name\-spaces to ECRS.
-
-In ECRS, a name\-space is identified by a public-private key pair (also
-referred to as the pseu\-do\-nym). The private key is used to sign
-the content that is placed into the name\-space, and the public key (or
-more precisely, the hash of the public key) is used as a public handle
-that is used to refer to the name\-space. Any user can create any
-number of pseudonyms. Once the user accesses files from a particular
-name\-space it is possible to form an opinion about a particular
-pseudonym, which can then be used to target the search.
-
-Adding name\-spaces to the design requires a new type of block, called
-an {\em SBlock}. An {\em SBlock} contains the key and query hash
-(CHK) of the top {\em IBlock} together with the metadata belonging to
-the content, thereby allowing users that receive an {\em SBlock} to
-download the file. However, this data is encrypted such that
-intermediaries do not learn anything about the referenced file. The
-encryption key is the hash of an identifier that the inserter chose
-for the content. The identifier does not have to be unique and can,
-for example, be a keyword (to allow searching the name\-space) or a
-password (for private content). The encrypted portion of the {\em
-SBlock} is followed by a hash code which is the {\em query} identifier
-for the {\em SBlock}. The query identifier is the hash of the key
-(which makes it the hash of the hash of the identifier). When a user
-searches a name\-space, the request contains the hash of the public
-key of the pseudonym together with the query identifier. By using the
-hash of the key as the query identifier, the correct {\em SBlock} can
-be identified by intermediaries but not decrypted. At the same time,
-only the identifier and the hash of the public key of the pseudonym
-are required to construct both the query identifier needed to search
-the name\-space and the key needed to decrypt the {\em SBlock}.
-Finally, {\em SBlock}s contain digital signature of the other
-contents. This allows intermediaries to verify that a given {\em
-SBlock} was created by the owner of the name\-space.
-
-Since {\em SBlock}s are signed, it is possible to allow updates.
-Without a digital signature, a secure update mechanism is impossible,
-since anyone could publish a potentially illegitimate update. If the
-update requires a matching digital signature, forged updates are
-impossible. In order to allow content updates, the metadata of an {\em
-SBlock} can contain information about when and under which identifiers
-updates may be published. If such forward pointers are present, the
-owner of the namespace can decide to publish updates to a particular
-file at a later time. Since the private key used for signing is owned
-by a single entity, consistency issues from parallel updates do not
-arise. ECRS does not prevent the owner of the name\-space from publishing
-conflicting updates.
-
-It should be recognized that the same file can be part of multiple
-name\-spaces under multiple identifiers without the need for storing the
-file multiple times in the network. The {\em IBlocks} and {\em
-DBlocks} of the file do not need to be changed when the name\-space
-or name\-space identifier changes.
-
-Name\-spaces cannot completely solve the search problem. Most
-importantly, users would still have to find the name\-spaces themselves,
-and while it can be assumed that users can guess keywords, they are
-unlikely to be able to guess public keys for a name\-space search. ECRS
-alleviates this problem by also offering a pure keyword-based search in a
-{\em global} keyword space where any user can advertise content.
-Here, the disadvantage is clearly that it is possible for malicious
-users to pollute the global keyword space with advertisements and
-other inappropriate data. However, it is assumed that in that case
-users will use keywords that are more difficult to guess or only use
-the global keyword space to discover trustworthy name\-spaces, thus
-avoiding spam most of the time.
-
-
-\subsection{Keyword search} \label{kblocks}
-
-This section describes how information about name\-spaces or the CHK
+We will now describe how information about CHK
keys that are necessary to retrieve a file can be obtained by
searching using natural language {\em keywords} -- without revealing
the keywords to intermediaries. Searching requires the content
@@ -965,128 +810,6 @@
\end{figure*}
-
-\section{Extensions} \label{extensions}
-
-The vanilla ECRS encoding scheme still leaves some practical problems
-that should be addressed to facilitate real-life usability. For
-example, the manual effort of assigning or guessing keywords should be
-minimized. Also, the overall system should be efficient in practice.
-In particular, the system requires peers to frequently handle small,
-per-block queries, many of which may not have a answer that is locally
-available. The following subsections present some ideas on how these
-issues can be addressed.
-
-
-\subsection{Keyword inference} \label{keywords}
-
-One problem with ECRS is that the content must often be associated
-with keywords. Although this is vastly better than forcing the user
-to rely on ``meaningless" bitstrings as the only identifier, the keys
-must still be chosen so that the target audience can guess them. The
-simplest non-technical solution for this problem is for a group of
-users to agree on an informal standard for keywords. If content
-providers want to make it easy for others to guess a keyword, it is
-typically useful to follow informal conventions for keyword selection.
-For example, a reasonable convention may be to only use lower-case
-letters.
-
-A larger problem for a keyword-based search is that users may be
-reluctant to put in the effort to provide good keywords for the
-content that they provide. A solution to this problem is the {\tt
-libextractor} library~\cite{le2005}. {\tt libextractor} is a library
-for metadata extraction that is used to automatically extract keywords
-and other metadata, such as descriptions, comments and mime-types from
-files of various formats.
-
-
-\subsection{Directories}
-
-Another approach to avoiding searches is to group files into
-directories. Directories can help with the search problem since they
-reduce the need for searching. Also, they can be used to bundle
-similar content and thus help users avoid inappropriately labeled
-data. If several files of such a directory have appropriate
-descriptions, it is likely that the other files will also have been
-provided by a non-malicious party.
-
-Integrating directories into the ECRS scheme is fairly
-straightforward. A directory is simply a file that contains any
-number of {\em SBlock}s or {\em KBlock}s in plaintext (!). Like
-files, directories are immutable and are subjected to the same
-encoding for sharing.
-
-Note that it is possible for users to assemble a directory that refers
-to any combination of files: files the user inserted personally, files
-that the user downloaded, files that the user encountered as search
-results but never downloaded, or even invalid data (which would be
-interpreted as references that correspond to non-existent files).
-Directories can also refer to other directories, allowing users to
-build navigable structures similar to file systems or the World Wide
-Web. In particular it is possible to refer to contents of other users
-and even to files or directories that are supposed to be published in
-the future. Figure~\ref{fig:network} illustrates some of the possible
-reference relationships between the various constructs.
-
-
-\begin{figure*}[t]
-\begin{center}
-\small
address@hidden
- *+[F]{SBlock(\underline{Alice})} {\ar@/_/[rr]} & & Directory_1
{\ar@/_/[ll]} address@hidden>}[dll]} address@hidden>}[dl]}
address@hidden>}[d]} & *+[F]{KBlock(``food")} address@hidden>}[l]} \\
- *+[F]{SBlock(\underline{Bob})} address@hidden>}[dr]} &
*+[F]{KBlock(``soda")} address@hidden>}[d]} & *+[F]{KBlock(``soda")}
address@hidden>}[d]} & *+[F]{KBlock(``cola")} address@hidden>}[dl]} \\
- *+[F]{KBlock(``bob")} address@hidden>}[u]} & Document_1 & Document_2 &
Document_3 \\
-}
-\caption{
-ECRS allows the formation of complicated network structures. In this
-example, the {\em SBlock} of pseudonym \underline{\it {Alice}}
-eventually allows to retrieve two of the documents encoded in the
-system, as does {\em Kblock} for keyword ``food". Boxes
-denote simple blocks that serve as entry-points. The directory and
-the documents consist of trees of possibly many CHK-encoded blocks.
-Searching for keyword ``soda" would return two results pointing
-to different resources. Note that all the encoded resources,
-including the one document with no pointers to it, can be retrieved by
-knowing the CHK keys of their root {\em IBlock}s. }
-\label{fig:network}
-\end{center}
-\end{figure*}
-
-
-\subsection{Efficient lookups with bloom filters}
-
-Given that a query only requires the transmission of a hash code, the
-number of queries that any given peer may receive is quite high. The
-bandwidth required for the response can often be discounted, since
-a peer may only be able to respond to a fraction of the
-received queries. Assuming that queries dominate the traffic, over 50
-queries per second could be transmitted over a slow modem line. Many
-peers might not be able to perform disk-based database lookups at such
-rates. Worse, if peers are sharing gigabytes of content, simply
-keeping the index information in memory is also often no longer feasible.
-
-In order to dramatically reduce the necessary number of database
-accesses, ECRS can be supplemented with a bloom filter~\cite{bloom},
-which is a probabilistic data structure that uses little memory and
-can be used to filter out queries that definitely cannot be answered
-by the local peer. The bloom filter is guaranteed to allow all
-queries that can be locally answered through the filter, and will
-reject all but a statistically insignificant number of queries that
-cannot be answered locally.
-
-The size of the bloom filter in memory that is required to reduce the
-number of false-positives to approximately 3\% is about one byte (8
-bit with 5 bloom tests, $2^{-5} \approx 3\%$) per entry. This reduces
-the memory requirements for the index by a factor of 16-64, depending
-on the size of the hash. Since a node occasionally needs to remove
-content from the local database, additional bit counters for the bloom
-filter should be stored on the disk. The assumption is that
-changes to the filter are rare compared to the frequency of queries.
-Queries that pass through the bloom filter are forwarded to the
-database layer which then attempts to locate the content.
-
-
-
\section{Discussion} \label{discussion}
The fact that each {\em DBlock} can be encoded independently from any
@@ -1124,7 +847,7 @@
distribution of load for downloading purposes.
-\subsection{Attacks}
+% \subsection{Attacks}
ECRS is open to two types of attacks from censors. The most obvious
attack is to guess keywords and use those to compute queries for
@@ -1171,13 +894,13 @@
Another serious type of attack is spamming the global keyword space
with useless content. Popular keywords are an easy target since they
-are by nature easily guessed. Name\-spaces can theoretically eliminate
-this problem, however they create a new difficulty in assessing which
-pseudonyms represent users that provide valuable content. A secure
-reputation system, like Advogato~\cite{levien03advogato}, may be a
-step towards a technical solution for this problem. A possibly more
-important challenge for future work is making such complex solutions
-easily accessible for the average user.
+are by nature easily guessed. Directories and
+name\-spaces~\cite{ecrstechreport} are additional constructs which can
+help with this problem, especially in combination with secure
+reputation systems, such as Advogato~\cite{levien03advogato}. However,
+these technical solutions leave an important challenge for future
+work, which is making such complex solutions easily accessible for the
+average user.
%
@@ -1220,71 +943,6 @@
% \nocite{cohen02replication} % for now
-\subsection{{\em KBlocks} or triple-hash}
-
-The triple-hash that was used instead of {\em KBlock}s in our earlier
-work ~\cite{esed} allows for an attack by an active, participating
-adversary. The following paragraphs first briefly present the original
-scheme and discuss the attack, and then compare it with the {\em KBlock}
-approach taken in this paper.
-
-Let an {\em RBlock} be a new kind of block that also contains the
-metadata of a file (including the top CHK data). The only difference
-between {\em RBlock}s and {\em KBlock}s is that {\em RBlock}s are
-encrypted and requested using the following triple-hash scheme. For
-each keyword $k$, the {\em RBlock} $R$ is encrypted with $H(k)$ and
-stored as the pair $\{H(H(k)), E_{H(k)}(R)\}$. Using the keyword as
-the source for the key allows the receiver of the file to obtain the
-key by guessing.
-
-Querying for an {\em RBlock} is {\bf not} straightforward. The
-problem is that the intuitive choice for a query hash, $H(H(k))$ does not
-give intermediaries a way to verify that the (encrypted) response is
-correct. Instead of using $H(H(k))$, the initiator sends the
-so-called {\em triple-hash} query $H(H(H(k)))$. A peer that has stored
-$E_{H(k)}(R)$ under $H(H(k))$ can match the query hash with the response
-and send back the pair $\{H(H(k)), E_{H(k)}(R)\}$. Intermediaries can
-verify that the proof of authenticity, $H(H(k))$, hashes to the query
-$H(H(H(k)))$. Malicious peers cannot construct the proof $H(H(k))$
-without guessing $k$ or inverting the hash function.
-
-The problem with the triple-hash is that an adversary that is routing
-a response to a triple-hash request can substitute the encrypted
-content in the $\{H(H(k)), E_{H(k)}(CHK, size)\}$ response while
-maintaining the $H(H(k))$ token. The resulting reply $\{H(H(k)), X\}$
-still looks like a valid response to the triple-hash query
-$H(H(H(k)))$. The triple-hash thus does not protect against such a
-substitution attack by an intermediary. The impact of the attack is
-such that the network would propagate and possibly cache the invalid
-replies. The attack will not prevent the spread of valid replies
-through other routes in the system since multiple results to the same
-query are possible. Furthermore, any user searching for $K$ will not
-see the invalid results. The reason is that the attempt to decrypt
-$X$ with $H(K)$ will (with high probability) result in a malformed
-{\em RBlock}. Thus, the end-user is still protected from this type of
-spam. Nevertheless, the adversary can abuse network resources in the
-form of transmission and caching of invalid data.
-
-Replacing the triple-hash with {\em KBlock}s for ECRS comes at a
-relatively high price. Where the triple-hash only requires a simple
-hash operation to verify replies, {\em KBlock}s need to perform a
-public key operation. Worse, when publishing content or searching,
-the triple-hash scheme again only requires a few quick hash operations
-to compute the query or the content. With {\em KBlock}s, the cost
-increases to additionally generating a public-private key pair in
-addition to a public key operation and hash operations.
-
-Both {\em KBlocks} and the triple-hash are vulnerable to the guessing
-attack. Guessing is slightly easier for the triple-hash since the
-computation for each guess is much cheaper. Overall, {\em KBlocks}
-work better than the triple-hash against adversaries that
-indiscriminately attempt to abuse network resources, but at the
-expense of higher CPU utilization even in the absence of an attack.
-Thus, using the triple-hash scheme may still be reasonable in networks
-with limited CPU power or less stringent security requirements.
-
-
-
\section{Conclusion} \label{conclusion}
This paper has described an encoding scheme which hides shared data
Modified: GNUnet-docs/papers/ecrs/ref.bib
===================================================================
--- GNUnet-docs/papers/ecrs/ref.bib 2006-10-23 00:32:41 UTC (rev 3546)
+++ GNUnet-docs/papers/ecrs/ref.bib 2006-10-23 22:24:56 UTC (rev 3547)
@@ -559,3 +559,11 @@
year = "2002",
url = "citeseer.nj.nec.com/cohen02replication.html"
}
+
address@hidden ecrstechreport,
+ author = "Krista Bennett and Christian Grothoff and Tzvetan Horozov and J.
T. Lindgren",
+ title = "{An Encoding for Censorship-Resistant Sharing}",
+ url = "http://gnunet.org/download/ecrs.ps";,
+ note = "available at http://gnunet.org/download/ecrs.ps";,
+ year = "2003"
+}
Added: GNUnet-docs/papers/ecrs/techreport.tex
===================================================================
--- GNUnet-docs/papers/ecrs/techreport.tex 2006-10-23 00:32:41 UTC (rev
3546)
+++ GNUnet-docs/papers/ecrs/techreport.tex 2006-10-23 22:24:56 UTC (rev
3547)
@@ -0,0 +1,1322 @@
+\documentclass[runningheads]{llncs}
+%\documentclass[global]{svjour}
+%\pagestyle{empty}.
+
+\usepackage[ansinew]{inputenc}
+\usepackage{amsmath,amssymb,exscale,multicol,epsfig,graphics,verbatim,float}
+\usepackage[all,knot,poly]{xy}
+\usepackage{hyperref}
+
+\hypersetup{backref,
+ pdfpagemode=FullScreen,
+ pdftitle=An Encoding for Censorship-Resistant Sharing,
+ pdfauthor=Christian Grothoff and Krista Grothoff and Tzvetan Horozov and
Jussi T. Lindgren,
+ pdfkeywords=encoding privacy censorship resistant sharing file peer
distributed system network private information retrieval,
+ pdfsubject=Privacy Enhancing Technologies,
+ colorlinks=true}
+
+
+\begin{document}
+
+% Annoying grammar/style notes:
+% - try to avoid the use of ``encoding" as a noun on its own. ``encoding
+% scheme" or ``encoding mechanism" is better.
+%
+% Notes by JTL (06.jun.05):
+% - word 'convergent' is used in the end of the doc 'out of the blue'
+% (we should use it earlier when the idea is introduced)
+% [CG: yes, that's why I have the MIT FARSITE system in Todo above ]
+% [DONE]
+% - while I tried to simulate a 'first time reader' the big picture
+% of ECRS appeared a little muddled. A diagram of the relation of
+% the encoding and the extensions might be helpful. Now we have
+% just one figure and it lacks SBlocks. Also the directories,
+% bloomfilters and whatnots are left dangling unconnected in some limbo.
+% [ CG: A good figure would be more than welcome. ]
+% - (!) now more of the paper rests on the 'unprincipled' k-blocks
+% approach (that is, we present it as novel and offer no analysis, proof,
+% or other formal handling). i.e. this could be good basis for adversarial
+% paper rejection. for a naive example, could collisions be a problem?
+% Since this can't be the case with usual pubkey crypto (I assume),
+% its not a problem here, but maybe should add a mention of this anyway.
+% [ CG: Collisions are obviously as much as a problem as they are for
+% RSA key generation; I'm not sure what the problem is. ]
+% - Are there other ways the k-blocks can leak? Could we make the
+% concept appear more solid by adding citations to some pubkey papers
+% that analyze them w.r.t. the currently trendy security concerns?
+% [ CG: actually, yes. There is a paper to refer to.
+% Dan Boneh and others, Searchable public key encryption; need to
+% find and read ]
+% - Whats the style of the intended journal? Is it ok to be on this
high-handed
+% level as we are? For example, is it ok to take the noninvertibility
+% of a hash-function for granted and not provide a cite?
+% [ CG: Yes, it is for an audience that is intimately familiar with
cryptographic
+% primitives. Besides, lacking such references for the intended audience
+% would be something reviewers should point out without seeing it as a
+% reason for rejection (assuming we wrong wrt target audience/terminology)]
+%
+
+\title{An Encoding for Censorship-Resistant Sharing}
+\author{Christian Grothoff\inst{1}, Krista Grothoff\inst{2}, Tzvetan
Horozov\inst{3}, Jussi T. Lindgren\inst{4}}
+\authorrunning{C. Grothoff, K. Grothoff, T. Horozov, J.T. Lindgren}
+
+% \offprints{}
+\institute{
+ Department of Computer Science, University of Denver, USA \\
+ address@hidden
+\and
+ CERIAS / Interdepartmental Program in Linguistics, Purdue University, USA \\
+ address@hidden
+\and
+ Motorola Labs, USA \\
+ address@hidden
+\and
+ Department of Computer Science, University of Helsinki, Finland \\
+ address@hidden
+% \\
+%\vspace{0.4cm}
+% \texttt{http://www.gnu.org/software/GNUnet/} \\
+% address@hidden
+}
+
+\maketitle
+
+\begin{abstract}
+This paper describes ECRS, a content encoding scheme for
+censor\-ship-resistant peer-to-peer networking. The proposed encoding
+mechanism supports both efficient dissemination of encrypted data as
+well as encrypted queries over this data. Intermediaries can verify
+that an encrypted response matches an encrypted query without being
+able to decrypt either. Furthermore, ECRS allows users to share files
+encrypted under descriptive keys which are the basis for querying the
+network for content. With the proposed scheme, effective load
+balancing and swarm distribution are possible. The encoding mechanism
+handles data in small chunks, which can also be efficiently encoded on
+demand from the plaintext. The proposed encoding is conceptually
+simple and easy to implement.
+\end{abstract}
+
+% \keywords{privacy, sharing, verification, peer-to-peer}
+
+\section{Introduction}
+
+% censorship
+Internet censorship is a powerful weapon for oppressive governments,
+corporations and pressure groups in stifling dissent and suppressing
+dissemination of information. A variety of techniques can be used to
+censor online information; hard drives can be confiscated and
+searched, traffic can be filtered, and denial-of-service attacks can
+be performed against servers. In addition to these technical
+measures, individuals can be singled out and subjected to harassment.
+A common requirement for censorship in any form is the ability to
+{\em recognize} the objectionable information.
+
+% the big goal and how it relates
+The goal of the encoding scheme presented in this paper is to make it
+difficult to identify information stored or transmitted in a open {\em
+decentralized} wide-area network where many {\em untrusted}
+peers want to share data. The proposed encoding scheme, called ECRS,
+allows both content and queries to be encrypted while being
+transmitted or stored on the network. This ensures that
+intermediaries remain oblivious to the data they are
+handling, reducing the chance that they can be singled out
+for an attack or held liable. It is important to note that the
+primary goal is {\em deniability} for the peers storing and
+transmitting the information. These peers must be able to claim that
+decrypting the information is infeasible {\em for them}.
+
+We find it acceptable if a censor who knows precisely which content to
+censor is able to match a request or response against that particular
+content. ECRS is supposed to protect intermediaries that merely
+transmit information and that need to be able to show that they are
+unable to recognize objectionable information for their own
+protection. The ultimate senders and receivers of the data should be
+protected by other means, such as anonymous
+routing~\cite{dingledine02mixminion,syverson97anonymous}. As a
+content encoding mechanism, ECRS could be integrated into almost any
+generic peer-to-peer infrastructure to enhance its resistance to
+censorship. Specific details on how peers communicate or route data
+are therefore outside of the scope of this paper.
+
+The definition of censorship resistance used in this work is similar
+to the formal definition given by~\cite{perng2005csr}, in which
+censorship resistance is defined as the inability of a censor to
+restrict a targeted document while allowing at least one other
+document to be retrieved. In the context of~\cite{perng2005csr}, the
+adversary is granted extensive capabilities. In particular, the
+adversary is allowed to inspect every request or response, transcript
+the processing steps of all the peers and then decide whether to
+filter (drop) a given response. Availability of the service and
+anonymity of the participants are specifically decoupled from
+censorship resistance. For ECRS, an almost identical adversary model
+is selected -- while anonymity and availability can certainly be
+additional (and often important) goals, ECRS is an orthogonal
+mechanism. The primary difference in the adversary model for ECRS is
+that the attacker is not allowed to be able to guess the exact content
+that is to be censored. This is an important restriction in practice.
+In the absence of such a restriction,~\cite{perng2005csr} shows that
+censorship resistance requires a form of private information retrieval
+for which each operation has complexity $O(n)$, where $n$ is the size
+of the datastore. In return for restricting the guessing capabilities
+of the adversary, ECRS can achieve $O(1)$ complexity for its
+operations. Considering that scalability is also an important goal,
+we believe that this is a reasonable trade-off.
+
+As an encoding scheme, ECRS has to address two important issues.
+First of all, users must be able to find content, preferably by
+searching with simple, natural language keywords. Metadata related to
+the contents of the file should be made available as part of the
+search result and prior to the download of the actual file. Metadata
+can include anything from user-provided content descriptions to
+thumbnails (for images) and automatically detected mime-types.
+Secondly, the encoding scheme should support swarming -- that is, the
+download of a file from multiple peers. Since it is possible that
+identical data could be inserted by many independent parties, the
+encoding scheme should always result in identical encodings for
+identical source files. This special form of encryption was probably
+first described in~\cite{clark99distributed} and later termed {\em
+convergent encryption}~\cite{farsite}. With convergent encryption,
+the existence of multiple copies of the same content can be detected;
+this knowledge can then be used to increase fault-tolerance,
+performance and availability.
+
+% why is this hard? open network == adversaries playground
+Unfortunately, it is not enough to just meet requirements related to
+efficient storage and retrieval of the content. A public filesharing
+network should be open to new participants without any restrictive
+form of access control. This opens the network to malicious
+participants. Thus, the encoding scheme should guarantee the {\em
+integrity} of the content, even in the presence of malicious
+participants. The encoding mechanism must ensure that invalid replies
+are detected and that peers can distinguish valuable content from
+maliciously generated noise. This is particularly important in three
+cases. First, if large files are assembled using blocks from multiple
+peers, some of these peers may be malicious and try to corrupt the
+file. These corruptions should be detected on a small granularity
+level and repaired with correct data from other peers. Second, for
+searches it should be difficult for peers to spam the result set;
+otherwise, the users may drown in useless information. Finally,
+intermediaries that are merely routing the content should be able to
+detect invalid replies. This enables the existence of local economies
+(such as those in~\cite{ebe2003}) and prevents the retransmission and
+replication of corrupted data by non-malicious peers.
+
+This paper introduces the primitives that ECRS uses to achieve these
+goals: a specific altered variant of the Content Hash Key (CHK), a
+primitive used in~\cite{clark99distributed}, and {\em KBlocks}, a
+novel construction which adds functionality to the ECRS scheme while
+avoiding a proposed attack on the triple-hash primitive used
+in~\cite{esed}. These primitives allow data to be inserted under
+multiple natural-language keywords at minimal cost in space, and
+queried using natural language boolean searches. Furthermore, the
+primitives give ECRS the means to identify, encrypt, decrypt and
+verify data, all while avoiding attacks by a non-guessing intermediate
+adversary. Verification of content by intermediate hosts is made
+possible without revealing the keys necessary to decrypt content, and
+the amount of data corruption an adversary can inject before being
+detected is limited to a small size. Additionally, the construction
+of these primitives makes ECRS quite scalable, and assists the
+encoding scheme in encouraging load-balancing, distribution and
+replication of content, and swarming. These primitives (and their
+functionality) are described in greater detail later in the paper.
+
+
+%% now some meat
+%ECRS uses two fundamental primitives in the overall encoding scheme.
+%The majority of the data is encrypted with a variant of Freenet's CHK
+%encoding~\cite{clark99distributed}. CHK stands for Content Hash Key;
+%in other words, the content is encrypted with a key that is derived
+%from a cryptographic hash of the plaintext. The encrypted content is
+%hashed again to obtain the query hash, which is then used to request the
+%content. This key-query pair is what the receiver needs to download
+%and decrypt the content.
+%
+%The primary difference between the use of CHK in ECRS and that used in
+%by~\cite{clark99distributed} is that ECRS does not subject entire
+%files to the CHK encoding.
+%Instead, files are split into fixed-size blocks which could then be
+%individually distributed (and replicated) across peers in the network;
+%this is a natural way to balance the load and to enable swarming. These
+%fixed-size blocks can be individually identified, encrypted, decrypted and
+%verified. Each block is identified by one or two hash codes, and the
+%blocks are encrypted using a key that is seperate from the hashes
+%used for identification. Verification only requires the
+%encrypted block and the query hash; it does not reveal the key required to
+%decrypt the block. ECRS guarantees that it is hard to forge a
+%response that passes verification for a given query, and splitting files
+%into blocks allows ECRS to detect data corruption on the block level.
+%Malicious peers cannot transmit more than the selected block size of
+%invalid data before being detected.
+%
+%The second primitive used by ECRS, the {\em KBlock}, is completely
+%novel. {\em KBlock}s allow users to securely obtain the key-query
+%pair by entering a natural language keyword selected by the content
+%provider. The primitive used to achieve this in~\cite{esed}, the
+%triple hash, is improved on in this work in that KBlocks {\em cannot}
+%be attacked successfully by a non-guessing intermediary. This kind of
+%attack is avoided through the use of signatures from deterministically
+%generated public keys to sign content advertisements. Additionally,
+%using {\em KBlock}s, documents can be inserted under multiple keys at
+%a minimal cost in terms of space. Users can perform boolean searches
+%of the form {\tt a AND b} which then return the documents which were
+%inserted under a matching set of keywords. Before the download, the
+%user can refine the search results using the metadata associated with
+%the file.
+
+% organization
+The rest of the paper is organized as follows. Section~\ref{related}
+contrasts the current work with mechanisms used in other
+censorship-resistant systems. Section~\ref{content} describes the
+ECRS encoding scheme in detail. Section~\ref{extensions} lists some
+extensions to the basic scheme. Finally, Section~\ref{discussion}
+discusses attacks on ECRS and contrasts it with previous work.
+
+% previous version
+This work builds on our earlier paper~\cite{esed} which was first
+published at ACISP 2001. Since then, the encoding scheme has been
+revised to address additional requirements an to improve the security
+in various aspects. This paper reflects these changes.
+
+
+
+\section{Related Work} \label{related}
+
+A large number of censorship-resistant (or at least
+fault-tolerant) publishing systems have been proposed in recent years
+\cite{anderson96eternity,chen99prototype,clark99distributed,freehaven-berk,feamster-infranet,herlihy87how,waldman2001tangler,pub00}.
+The proposed protocols differ in various aspects unrelated to the
+specifics of the encoding mechanism, such as content replication and the use of
+anonymous or steganographic communication. Characteristic of all of
+these systems is the use of replication and the need to ensure data
+integrity. For an overview of content replication strategies see
+\cite{cohen02replication}. The censorship-resistant systems all use
+some form of content encoding to hide the specifics of the content
+from the servers.
+
+
+\subsection{Freenet}
+
+The main content encoding scheme used in
+Freenet~\cite{clark99distributed} uses CHKs: the hash of the content
+is used as the key. Freenet has several other types of keys which are
+used to refer the user to content-hash keys. These different key
+types are used to allow additional features such as content signing,
+personal name\-spaces and splitting of content. Freenet's CHK yields
+the same encrypted data for independent encryptions. However, it has
+several disadvantages.
+
+One drawback of Freenet's CHK is that it does not allow direct sharing
+of files from the local drive without encrypting and inserting them
+first. Thus, if a node operator wishes to keep content directly
+accessible on the host, a local copy of the plaintext must be kept in
+addition to the encrypted content in the Freenet database. Also,
+Freenet does not support swarming. One reason for this is that
+Freenet's CHK encoding can only verify a file in its entirety and not
+pin-point corruptions on a smaller scale.
+
+One way to obtain the CHK key of a file in Freenet is to search a
+private subspace. A subspace contains a set of CHK keys that have
+been cryptographically signed by the owner of the subspace and placed
+into the subspace under a certain keyword. These signed references
+are called subspace-signed keys (SSK). Given the subspace-prefix and
+the keyword, users can obtain the CHK key. The form of the keywords
+can be freely chosen, allowing for conventions such as dates in the
+keyword to be used for updates (in Freenet's terminology, these are
+called {\em date based redirects}).
+
+In addition to CHK and SSK keys, Freenet supports KSK keys. A KSK key
+is essentially a CHK key stored in plaintext (!) under a keyword. The
+protocol attempts to ensure that there cannot be two different CHK
+keys available in the network under the same keyword. While
+collisions for KSK keys are supposedly not allowed, the protocol
+cannot prevent them from occurring. If an attacker inserts meaningless
+data under a common keyword, Freenet will try to preserve that content
+because it is frequently requested. Subsequently, that keyword can no
+longer be used for any useful data since the peers attempt to enforce
+the no-collisions rule. Note that the no-collision rule cannot be
+enforced for malicious peers. For these reasons, the Freenet
+developers consider the use of KSK keys insecure and recommend against
+using them.
+
+As a result, Freenet effectively does not support any type of
+keyword-based search. The CHK keys must be found by using keyservers
+or ad-hoc applications built upon the basic solution by using
+incremental numbers as parts of keywords in signed namespaces. The
+disadvantage of keyservers is that they must be maintained if the
+indexed keys are to be kept up-to-date. Freenet does not seem to use
+any encryption for the data stored in KSK or SKS keys and therefore
+fails to prevent intermediaries from learning the CHK keys, making
+censorship by intermediaries easier.
+
+
+\subsection{Free Haven}
+
+In Free Haven~\cite{freehaven-berk}, documents are split into $n$
+shares which are distributed over a number of servers. Any $k$ out of
+$n$ shares are sufficient to reconstruct the entire
+document~\cite{rabin89efficient}. To retrieve a document, the user
+must obtain the key that was used to sign the document from some
+source outside the Free Haven network. The design of Free Haven
+itself does not discuss any search functionality. The user then
+forwards the key to the server which encrypts and sends its share of
+the document.
+
+Shares are encoded with an information dispersal algorithm (IDA).
+Hosts are still able to exercise editorial control over the content
+since the IDA does not prevent hosts from decoding parts of the
+plaintext. Also, the $k$ out of $n$ share reconstruction scheme does
+not allow reconstruction of a file by mixing shares from independent
+insertions with different values for $k$ or $n$.
+
+
+\subsection{Mnet and Mojo Nation}
+
+Mnet is the successor of Mojo Nation~\cite{mojotech}, a peer-to-peer
+network that was the first to focus on using economic incentives when
+trading content. As the descendant of a commercial product, Mnet
+focuses mostly on efficiency and reliability. Nevertheless, Mnet
+encrypts files with AES using a user-supplied key to allow for
+privacy. The file is then broken into shares using an erasure code.
+Multiple shares are identified with an SHA-1 hash and stored in an
+inode. The file can be retrieved using the hash of the inode and the
+symmetric encryption key.
+
+The use of whole-file AES encryption and the use of an erasure code
+forces Mnet, as with Freenet, to store a second copy of the entire
+file in the Mnet data store even if the user retains a copy of the
+file in plaintext. The encoding makes it infeasible to encode parts
+of the file on request. The free selection of the AES key allows
+independent users to create completely different shares for identical
+files. Since the encryption of the content is a perfectly independent
+pass over the file, other encodings such as ECRS and Freenet's
+encoding could be easily extended to include this behavior if desired
+-- without the need to mandate a certain style of AES encryption.
+
+
+\subsection{Publius}
+
+Publius~\cite{pub00} is a static network that uses Shamir's
+algorithm~\cite{shamir} to split the key required to restore stored
+files between the available servers. The encrypted file is then
+stored on all servers. The servers cannot decrypt the file as the key
+is never revealed to them.
+
+Publius keys are random strings. The system does not provide any
+search mechanism and expects the users to obtain the keys from an
+alternate source. Publius never discards any content and thus assumes
+that disk space is never a limitation.
+
+
+\subsection{Tangler}
+
+The Tangler network~\cite{waldman2001tangler} is a system where new
+content is entangled with old content. This entanglement introduces a
+dependency which makes it impossible to retrieve a piece of content if
+the other content that it was entangled with is lost. While this
+makes it impossible to censor specific content without losing
+unrelated content (since the entanglement pairs are chosen randomly),
+this process {\em doubles} the amount of data that must be transported
+by the network. This scheme fails to address the fact that an
+adversary may not care about losing other data when attempting to
+censor content. Also, nothing prevents the adversary from first
+making a copy of important documents and re-inserting them into the
+system after the censorship operation.
+
+Tangler has some similarities with ECRS. In particular, it uses hash
+trees for integrity checks on fixed-size blocks of data. However,
+unlike ECRS, the Tangler encoding uses Shamir's secret
+sharing~\cite{shamir} to entangle the block with other, pre-existing
+blocks, preferably from other documents. Both Tangler and ECRS
+(as well as Freenet) use cryptographically signed data,
+which Tangler calls collections.
+ECRS has analogous constructions to Tangler's collections, referred to
+in this paper as {\em directories} and {\em namespaces}; however, unlike
+ECRS, a Tangler collection has a versioned root which explicitly lists
+all of the contents in the collection, resulting in one of Tangler's
+global synchronization problems. % [FIXME: better w/ CITE].
+Placing a document in a Freenet
+subspace or ECRS namespace only requires that it be adequately signed.
+
+
+\subsection{Gnutella and FastTrack} % what does DirectConnect do?
+
+% ? are these censorship-resistant? ;) if anything goes, there's lot
+% of choices. -- jtl
+% ! well, they're obviously at least not doing a good job, but that
+%does not mean that they should not be discussed *briefly*. The
+%problem/attack applies to a whole range of systems and is a good
+% motivation for the merkle tree. Also, the decentralization of
+% gnutella was one of the reasons why it was heralded as the
+% ``censorship resistant" successor of napster... -- cg
+% I agree... they're ``related work" in that sense, brief mention
+% is fine as long as we keep it brief -- klb
+
+The FastTrack network\footnote{Protocol description from the giFT-FastTrack
+ project is available at
+\vspace{3mm}
+
+\url{http://gnunet.org/papers/FAST-TRACK-PROTOCOL}.
+
+\vspace{2mm}
+} and modern variants of the Gnutella protocol use the SHA-1 hash code
+of the shared files to uniquely identify files. The SHA-1 hash codes
+are used to identify identical files stored on different peers. The
+peers can then use this information to download the file from multiple
+sources (swarming). The problem with this approach is that the SHA-1
+hash codes can only be verified once the entire file has been
+retrieved. To ruin a download, it suffices for a malicious peer
+to contribute just one single invalid block. The presence of an invalid
+block could only be detected after the entire file was retrieved.
+Worse, the simplistic SHA-1 approach does not give peers any way to
+identify the location of the invalid block or the malicious peer.
+
+Neither FastTrack nor Gnutella use file encryption. Consequently, they
+do not provide any protection from censorship beyond decentralized
+routing of requests.
+
+
+\subsection{Distributed File Systems}
+
+Various distributed file systems based on a peer-to-peer
+infrastructure have been built in recent
+years~\cite{cfs:sosp01,mazires00sfs,mazieres02building,muthitacharoen02ivy,rowstron01storage}.
+These systems typically do not focus on censorship resistance and
+consequently do not encrypt the contents. Modern systems
+like~\cite{cfs:sosp01,rowstron01storage} route content using
+distributed hash tables~\cite{maymounkov02kademlia,stoica01chord} to
+achieve $O(\log n)$ scalability. Writable distributed file systems
+typically require users to authenticate themselves before being
+granted access to the system by one of the
+servers~\cite{mazires00sfs}. ECRS focuses on encrypting shared data
+while allowing peers to verify the integrity of the encrypted data
+that they are routing. In SUNDR~\cite{mazieres02building} a similar
+problem is addressed; here users can detect tampering by the
+(untrusted) server that is storing the data in a setting where
+multiple users are updating the same data. SUNDR achieves what is
+called {\em fork consistency}, a guarantee that if the server passes a
+version that lacks the changes of one client to another client at one
+point in time, it can never again make the changes of either client
+visible to the others. This is a weaker guarantee than the optimal
+situation where any misbehavior is detected; however, it is the
+strongest possible property that can be achieved given the security
+model used. ECRS does not allow users with distinct pseudonyms to
+update the same content without essentially creating two files. This
+allows ECRS to guarantee that peers can never return an {\em invalid}
+result since every copy can be uniquely identified at all times.
+
+
+\section{ECRS encoding} \label{content}
+
+% so we have another introduction here w/ clear redundancy -jtl
+% the first paragraph sucks too
+
+The primary requirements for the ECRS encoding are {\it plausible
+deniability} and {\it robustness}. Plausible deniability describes
+the ability of the participants to claim ignorance of the nature of
+transferred content. The idea here is that by making it hard for
+intermediaries to determine the contents that they are routing, they
+are less likely to casually infringe on the privacy of other users, to
+be forced to do so by an adversary, or to be held responsible
+for the actions of others that they were unwittingly
+facilitating.\footnote{If the data cannot be identified, editorial
+control is technically impossible. In {\em Stratton Oakmont
+v. Prodigy}, an Internet provider was found liable for hosting a
+bulletin board on which offensive messages had been posted. This
+finding resulted because the provider had hired individuals to
+exercise editorial control over content. If the provider had merely
+published messages from users without interference, the provider would
+potentially not have been held accountable~\cite{stratton_oakmont}.}
+Robustness is the ability of the encoding to resist attacks such as data
+corruption and spam. Spam is different from data corruption in that
+the goal of the spammer is to direct the user to undesirable content,
+possibly hiding useful information in a sea of useless results.
+Naturally the encoding should not significantly increase the amount of
+data that needs to be transferred.
+
+The ECRS encoding scheme addresses these requirements. ECRS provides
+plausible deniability by hiding the nature of the queries and
+responses from intermediaries through encryption. Despite the fact
+that queries and responses are encrypted, intermediaries can {\em
+verify} that the responses are valid with respect to a particular
+query. Thus, the encoding mechanism provides robustness against
+tampering and false replies. Additional robustness is gained in ECRS
+by splitting files into blocks that can be {\em independently}
+verified, stored and distributed across the network. This makes it
+easy for protocols using ECRS to incorporate features such as swarm
+distribution~\cite{hartman99swarm}, load balancing and
+microeconomics~\cite{ebe2003}. These features are also significant
+from the viewpoint of scalability. When all handled blocks are small,
+nodes can participate in the network activity even if their own
+resources are limited. Also, storing small, individually
+unintelligible pieces of potentially objectionable content is likely
+to further support plausible deniability.
+
+
+
+ECRS uses two fundamental primitives in the overall encoding scheme.
+The majority of the data is encrypted with a variant of Freenet's CHK
+encoding~\cite{clark99distributed}, where CHK stands for Content Hash
+Key. In other words, the content is encrypted with a key that is
+derived from a cryptographic hash of the plaintext. The encrypted
+content is hashed again to obtain the query hash which is used to
+request the content. This key-query pair is what the receiver needs
+to download and decrypt the content.
+
+The primary difference between the use of CHK in ECRS and that used
+in~\cite{clark99distributed} is that ECRS does not subject entire
+files to the CHK encoding. Instead, files are split into fixed-size
+blocks which could then be individually distributed (and replicated)
+across peers in the network; this is a natural way to balance the load
+and to enable swarming. These fixed-sized blocks can be individually
+identified, encrypted, decrypted and verified. Each block is
+identified by one or two hash codes, and the blocks are encrypted
+using a key that is independent of the hashes used for identification.
+Verification only requires the encrypted block and the query; it does
+not reveal the key required to decrypt the block. ECRS guarantees
+that it is hard to forge a response that passes verification for a
+given query, and splitting files into blocks allows ECRS to detect
+data corruption on the block level. Malicious peers cannot transmit
+more than the selected block size of invalid data before being
+detected.
+
+The second primitive used by ECRS, the {\em KBlock}, is completely
+novel. {\em KBlock}s allow users to securely obtain the key-query
+pair by entering a natural language keyword selected by the content
+provider. The primitive used to achieve this in~\cite{esed}, the
+triple hash, is improved on in this work in that {\em KBlock}s {\em
+cannot} be attacked successfully by a non-guessing intermediary. The
+triple hash scheme was vulnerable to possibile substitution
+attacks by intermediaries. {\em KBlock}s defeat this
+attack by signing content advertisements using
+deterministically generated public keys.
+Additionally, by using {\em KBlock}s, documents can
+be inserted under multiple keys at a minimal cost in terms of space.
+Users can perform boolean searches of the form ``a AND b" which then
+return the documents which were inserted under a matching set of
+keywords. Before the download, the user can refine the search results
+using the metadata associated with the file.
+
+
+
+The rest of this Section gives a bottom-up description of ECRS. After
+a brief overview, Part~\ref{dblocks} shows how individual data blocks
+are encrypted in order to make it impossible for the intermediaries to
+determine what they are storing or transmitting. Part~\ref{iblocks}
+then describes how files are split into those data blocks.
+Parts~\ref{sec:search} through~\ref{kblocks} motivate and explain how
+ECRS enables users to search for content without exposing the
+plaintext of the keyword or the corresponding content and how
+intermediaries can verify that a given encrypted reply matches the
+(encrypted) query. Finally, the core of ECRS is summarized in the
+form of the encoding algorithm and a protocol example.
+
+\begin{figure*}[t]
+\begin{center}
+\small
address@hidden
+ &&&& KBlock\ar[d] &&&&\\
+ &&&& address@hidden>}[d]\ar[drrr] &&&& \\
+ & address@hidden>}[d]\ar[dr] &&&
address@hidden>address@hidden>address@hidden>}[dr] &&&
+ address@hidden>}[d]\ar[dr] & \\
+ DBlock_1\ar[dd]+<0cm,0.25cm> & address@hidden>}[dd]+<0cm,0.25cm> &
DBlock_{l}\ar[dd]+<0cm,0.25cm>&& address@hidden>}[dd]+<0cm,0.25cm>
+ && DBlock_{m}\ar[dd]+<0cm,0.25cm> & address@hidden>}[dd]+<0cm,0.25cm> &
DBlock_{n}\ar[dd]+<0cm,0.25cm> \\
+ &&&& \save[d]*+[F]{\texttt{\hspace*{4.3cm} Original data \hspace*{4.3cm}}}
\restore &&&& \\ % FIXME: put this in a box and across all rows!
+ &&&& &&&& \\
+} % FIXME: replace solid arrows with dotted arrows for dotted targets!
+\caption{Simple encoding of a file using a tree of CHK blocks
+ ($DBlock$s and $IBlock$s are CHK encoded) with
+ one $KBlock$ to allow for a keyword-based search.}
+ \label{encodingfile}
+\end{center}
+\end{figure*}
+
+\subsection{Overview}
+
+In ECRS, the encoded representation of a file is a collection of
+blocks. There are four types of blocks: {\em DBlocks}, {\em IBlocks},
+{\em SBlocks} and {\em KBlocks}. The maximum size of all blocks in
+ECRS is supposed to be fixed as some small number (e.g. 32Kb).
+The blocks are used to create a tree structure of the encoded file
+(see Figure~\ref{encodingfile}). The actual file data is encoded in
+{\em DBlocks} which are organized by a tree of {\em IBlocks}. The
+{\em IBlocks}, which are similar to UNIX inodes~\cite{mckusick84fast},
+are indirection blocks which encode how the leaf nodes of the tree can
+be reassembled into the original file. Every {\em IBlock} provides
+the data required to request, decrypt and verify the contents of its
+direct children. Verification is done using hash codes of the
+children, similar to the way a Merkle tree
+\cite{merkle89tree} works. Given the size of the file, the top {\em
+ IBlock} uniquely identifies the contents of the entire file. {\em
+ KBlocks} and {\em SBlocks} facilitate obtaining the key hash (to decrypt)
+ and query hash (to request) for the top {\em IBlock}.
+
+\subsection{{\em DBlocks}} \label{dblocks} % CHK
+
+Every {\em DBlock} corresponds to 32Kb of the original file (the last
+block may be padded with zeros if the file end does not fall on a 32Kb
+boundary). {\em DBlock}s are encrypted using a symmetric cipher. For
+the {\em DBlock} that corresponds to a plaintext block $B_i$, the key
+for the cipher is $K_i := H(B_i)$. This guarantees that the same
+block will always be encrypted with the same key. Also, the integrity
+of the decrypted block can be verified by checking that $K_i =
+H(B_i)$. The encrypted block $E_{K_i}(B_i)$ can be uniquely
+identified by its hash $Q_i := H(E_{K_i}(B_i))$. A peer can query for
+$E_{K_i}(B_i)$ using the query hash $Q_i$ without revealing $K_i$.
+Consequently, the pair $(K_i, Q_i)$ can be used to retrieve and
+decrypt $B_i$. Intermediaries can verify that a response
+$E_{K_i}(B_i)$ matches a query hash $Q_i$ without knowing $K_i$.
+Freenet~\cite{clark99distributed} uses the same scheme to encrypt
+entire files (not just blocks) and the authors call the pair $(K_i,
+Q_i)$ a content hash key (CHK).
+
+\subsection{{\em IBlocks}} \label{iblocks} % CHK+Tree
+
+For files larger than the blocksize, multiple CHK keys are required to
+retrieve the content. For example, with a blocksize of 32Kb and
+512-bit hash codes, a 32Mb file would be split into 1024 {\em
+DBlocks}, $B_1, \ldots, B_{1024}$, of length 32Kb each. Groups of up
+to 256 CHKs are assembled into one 32Kb {\em IBlock}, resulting in
+four {\em IBlock}s for the 32Mb file. The resulting {\em IBlock}s are
+CHK encrypted in the exact same manner as the {\em DBlocks} and their
+CHK-keys are again grouped into {\em IBlocks} until only one CHK key
+is left. For the 32Mb file, the CHKs for the four {\em IBlock}s are
+thus collected in one final top {\em IBlock}. The additional space
+requirements for encoding the file are typically less than 1\% of the
+original file size.
+
+\subsection{Finding files} \label{sec:search}
+
+
+The CHK encoding described so far is useful for transmitting content
+that is encoded and yet verifiable for intermediaries. However, a
+practical file-sharing scheme needs to provide functionality such that
+the users can obtain the query hash and the key that are now necessary
+in order to retrieve and decrypt the encoded content. While
+out-of-band communication of those CHK keys is certainly feasible, an
+integrated solution is clearly desirable. Related work on secure
+indexing~\cite{secure2004goh} allows servers to retrieve documents by
+keyword without learning about the rest of the document. The scheme
+that will be described in Section~\ref{kblocks} improves on this by
+keeping the keyword itself private. Additionally, it still allows
+intermediaries to verify the correct operation of the server. It also
+avoids the need for the publisher to encrypt the document with the
+public key of a {\em specific} receiver, thereby theoretically
+permitting arbitrary participants to access same encrypted content (as
+long as they are able to obtain or guess the necessary keyword).
+
+The key problem for the search is that simply publishing CHK keys in
+plaintext under certain keywords (as done in Freenet with KSK keys)
+has various drawbacks. First, intermediaries would learn about the
+CHK keys that they are storing or transmitting, which could allow them
+to easily censor search results. Second, the keywords are directly
+exposed to the intermediaries, which again would facilitate
+censorship. Finally, peers would be able to send invalid replies that
+refer to inappropriate content. This may be just a nuisance if
+malicious peers use this for advertising (a kind of behavior can be
+observed on gnutella from time to time). Possibly worse, if a network
+wants to economically reward peers for returning search results, the
+possibility of returning arbitrary nonsense might make such incentive
+schemes impractical.
+
+But how can a system prevent peers from returning invalid responses to
+a keyword-based search? Since it is inherent in the nature of such a
+search that the initiator does not know precisely what content is
+desired, it is impossible for the query to completely determine the
+reply. For this reason, schemes like CHK cannot be applied to the
+keyword-search problem: in CHK, the query hash completely determines the
+reply. As a result, a keyword-based search mechanism where a query
+should possibly have multiple valid results cannot be implemented
+based on CHK. Since for this kind of search there cannot be any
+completely deterministic link between the keyword and the content,
+ECRS must trust the user who is uploading the content to provide a
+valid link. That user must specify appropriate keywords (and
+metadata) that properly describes the content. Clearly this trust may
+be misplaced. The uploader may specify keywords that have no semantic
+relation with the content. One solution to this problem is the use of
+namespaces, which attack the issue by enabling users to learn which
+uploaders are trustworthy.
+
+
+\subsection{Namespaces} \label{sblock}
+
+One way to avoid searching in an untrustworthy global keyword space
+that may contain mostly inappropriately-labeled content is to restrict
+the search to name\-spaces. A name\-space is a keyword space that
+contains content that is cryptographically signed with the same
+private key. The concept of name\-spaces is also present in
+Freenet~\cite{clark99distributed}, but with Freenet it is not possible
+to obtain multiple results by searching a name\-space. Fortunately, it
+is easy to add {\em searchable} name\-spaces to ECRS.
+
+In ECRS, a name\-space is identified by a public-private key pair (also
+referred to as the pseu\-do\-nym). The private key is used to sign
+the content that is placed into the name\-space, and the public key (or
+more precisely, the hash of the public key) is used as a public handle
+that is used to refer to the name\-space. Any user can create any
+number of pseudonyms. Once the user accesses files from a particular
+name\-space it is possible to form an opinion about a particular
+pseudonym, which can then be used to target the search.
+
+Adding name\-spaces to the design requires a new type of block, called
+an {\em SBlock}. An {\em SBlock} contains the key and query hash
+(CHK) of the top {\em IBlock} together with the metadata belonging to
+the content, thereby allowing users that receive an {\em SBlock} to
+download the file. However, this data is encrypted such that
+intermediaries do not learn anything about the referenced file. The
+encryption key is the hash of an identifier that the inserter chose
+for the content. The identifier does not have to be unique and can,
+for example, be a keyword (to allow searching the name\-space) or a
+password (for private content). The encrypted portion of the {\em
+SBlock} is followed by a hash code which is the {\em query} identifier
+for the {\em SBlock}. The query identifier is the hash of the key
+(which makes it the hash of the hash of the identifier). When a user
+searches a name\-space, the request contains the hash of the public
+key of the pseudonym together with the query identifier. By using the
+hash of the key as the query identifier, the correct {\em SBlock} can
+be identified by intermediaries but not decrypted. At the same time,
+only the identifier and the hash of the public key of the pseudonym
+are required to construct both the query identifier needed to search
+the name\-space and the key needed to decrypt the {\em SBlock}.
+Finally, {\em SBlock}s contain digital signature of the other
+contents. This allows intermediaries to verify that a given {\em
+SBlock} was created by the owner of the name\-space.
+
+Since {\em SBlock}s are signed, it is possible to allow updates.
+Without a digital signature, a secure update mechanism is impossible,
+since anyone could publish a potentially illegitimate update. If the
+update requires a matching digital signature, forged updates are
+impossible. In order to allow content updates, the metadata of an {\em
+SBlock} can contain information about when and under which identifiers
+updates may be published. If such forward pointers are present, the
+owner of the namespace can decide to publish updates to a particular
+file at a later time. Since the private key used for signing is owned
+by a single entity, consistency issues from parallel updates do not
+arise. ECRS does not prevent the owner of the name\-space from publishing
+conflicting updates.
+
+It should be recognized that the same file can be part of multiple
+name\-spaces under multiple identifiers without the need for storing the
+file multiple times in the network. The {\em IBlocks} and {\em
+DBlocks} of the file do not need to be changed when the name\-space
+or name\-space identifier changes.
+
+Name\-spaces cannot completely solve the search problem. Most
+importantly, users would still have to find the name\-spaces themselves,
+and while it can be assumed that users can guess keywords, they are
+unlikely to be able to guess public keys for a name\-space search. ECRS
+alleviates this problem by also offering a pure keyword-based search in a
+{\em global} keyword space where any user can advertise content.
+Here, the disadvantage is clearly that it is possible for malicious
+users to pollute the global keyword space with advertisements and
+other inappropriate data. However, it is assumed that in that case
+users will use keywords that are more difficult to guess or only use
+the global keyword space to discover trustworthy name\-spaces, thus
+avoiding spam most of the time.
+
+
+\subsection{Keyword search} \label{kblocks}
+
+This section describes how information about name\-spaces or the CHK
+keys that are necessary to retrieve a file can be obtained by
+searching using natural language {\em keywords} -- without revealing
+the keywords to intermediaries. Searching requires the content
+provider to supply metadata about the file; in particular, the content
+provider must supply a list of keywords. While the metadata is
+published as part of the {\em KBlock} and made available to the
+recipient the keywords are only used to compute the {\em KBlock}s and
+not made available to other users directly. It is assumed that the
+user searching for data is able to {\em guess} at least one of these
+keywords. The nature of the search implies that there is no direct,
+cryptographically verifiable relation between the keyword and the
+content. Many files can match a given keyword. Different users may
+sometimes have a different perception of what is a correct semantic
+match. Thus, a keyword search always has the potential of resulting
+in search results that a user may find inappropriate. It is also not
+possible to prevent a user from supplying keywords that have no
+semantic relation with the content and thereby increasing the chance
+of other users finding undesirable results for those keywords.
+
+Despite these fundamental drawbacks, ECRS should (and can) give some
+unusual {\em guarantees} for keyword-based searches. First, the
+keyword used for a search is not exposed to intermediaries in a way
+that would allow them to easily exercise editorial control (i.e. to
+censor queries). Note again that a guessing attack in which the
+intermediary guesses a keyword, computes the respective query hash, and
+attempts to match the query hash to the incoming query, is considered
+acceptable; plausible deniability for the intermediaries is unaffected
+by this attack. Secondly, only peers that have content available
+under the given keyword should be able to produce a valid response.
+In other words, the ultimate responder must have succeeded in guessing
+the keyword. This is important since it prevents peers from making up
+replies for arbitrary requests on-the-fly. If peers were able to
+respond to any keyword query without having to at least guess the
+keyword, they could use this to spam every possible search, rendering
+the keyword search mostly useless. Forcing responders to guess
+keywords does not eliminate the problem completely; however, it does
+limit the attack to the common, easily-guessed keywords. Finally, the
+verification that a response is valid should be possible not only for
+the final recipient, but also for intermediaries.
+
+ECRS achieves all of this with a {\em new cryptographic primitive}
+called {\it $K$-deterministic keys} which is a key pair $(Pub_{H(K)},
+Prv_{H(K)})$ generated from a keyword $K$. The hash $H(K)$ of the
+keyword is used as the seed and the only input to the pseudo-random
+number generator that generates the public-private key pair. The
+authors are not aware of any previous use of $K$-deterministic keys.
+Given such a key pair, the inserting peer generates {\em KBlock}s by
+signing the metadata necessary to download the file with $Prv_{H(K)}$.
+{\em KBlock}s are essentially like {\em SBlock}s with the difference
+that the $K$-determinate key is used instead of the pseudonym. The
+construction of a {\em KBlock} is shown in Figure~\ref{kblockdiagram}.
+
+\begin{figure*}[t]
+\begin{center}
+\small
+\xymatrix{
+ H(K) address@hidden>}[rrr]^{\texttt{(as random seed)}} }
address@hidden>}[ddr]^{ \texttt{(as key)} }} &&& *+[F]{Keygen}
address@hidden>}[dd]^{Prv_{H(K)}}} address@hidden>}[drr]^{Pub_{H(K)}}} & \\
+ & & & & & *+[F]{Join}
address@hidden>}[r]} & KBlock \\
+ data address@hidden>}[r]} & *+[F]{Encrypt}
address@hidden>}[rr]_{E_{H(K)}(data)} } && *+[F]{Sign} address@hidden>}[urr]}
\save[]+<3.1cm,0.4cm>*{ [E_{H(K)}(data)]_{Prv_{H(K)}} } \restore \\
+}
+\caption{The construction of a {\em KBlock}. The hash $H(K)$ of the keyword
$K$ is used to encrypt the
+ data and to seed the key generator. The obtained private key
$Prv_{H(K)}$ signs the encrypted data,
+ but is not otherwise used. Finally, the public key $Pub_{H(K)}$ is
appended to the signed data to
+ form the {\em KBlock}.}
+ \label{kblockdiagram}
+\end{center}
+\end{figure*}
+
+A peer searching for $K$ also computes $Pub_{H(K)}$ using the same
+deterministic key-generation algorithm ($Prv_{H(K)}$ is also computed
+but not used). The peer then uses $H(Pub_{H(K)})$ as the query hash.
+Intermediaries can verify that the response is valid by checking the
+{\em KBlock}s signature against its public key, and checking that the
+public key hashes to the query hash. Yet intermediaries are unable to
+decrypt the response or learn the keyword $K$ that was used to
+generate the public key without guessing.
+
+In conclusion, using {\em KBlock}s it is possible to allow
+intermediaries to verify the integrity of replies without learning the
+plaintext of the keyword or the response. {\em KBlock}s require a
+keyword guess, making it it harder to reply to arbitrary queries with
+random data; they cannot prevent users from inserting such data under
+popular keywords. The receiver of the {\em KBlock} can retrieve the
+rest of the file tree using CHK queries in the same way as it is done
+for {\em SBlock}s.
+
+
+\subsection{Summary}
+
+\begin{figure*}[t]
+\hrule
+\vspace{3mm}
+\small
+\begin{enumerate}
+ \item{Input: Content $C$, a list of keywords $\{K_1,...\}$ and metadata $D$.}
+ \item{Split content $C$ into blocks $B_i$, each of size 32Kb.
+ Call these {\em DBlocks}. \label{split}}
+ \item{Compute hash values $H^{key}_i = H(B_i)$, $E_i = E_{H_{key}}(B_i)$ and
+ $H^{query}_i = H(E_i)$. Form {\em CHK}$_i$ from
+ $(H^{query}_i, H^{key}_i)$.
+ Pad content (with zeros) if needed.\label{encryptStep}}
+ \item{Store $E_i$ under the name $H^{query}_i$.}
+ \item{If there is more than one block, group the blocks into disjoint sets
$I_j$
+ of up to 256 members. For each $I_j$, create {\em Iblock}$_j$
+ containing the {\em CHK}s of the blocks in $I_j$.
+ Add zero padding if needed. Process each new 32Kb block obtained
+ as in step~\ref{encryptStep}.}
+ \item{If the size of $C$ was smaller than 32Kb (and thus there is
+ only one pair of hashcodes {\em CHK}$_0$),
+ create {\em SBlock}s and {\em KBlock}s containing
+ {\em CHK}$_0$, the metadata $D$ about the content and
+ the original length of $C$.
+ Encrypt and sign the resulting {\em SBlock}s and {\em KBlock}s.}
+\end{enumerate}
+\vspace{2mm}
+\hrule
+\caption{The ECRS encoding algorithm.}
+\label{ECRS}
+\end{figure*}
+
+The ECRS encoding algorithm is summarized in Figure~\ref{ECRS}.
+Figure~\ref{protocol} shows the sequence of messages exchanged
+by peers to download a 64Kb file starting with a keyword.
+
+
+\begin{figure*}[t]
+\small
+\hrule
+\vspace{3mm}
+$B$ shares file which is encoded as $B_1, B_2$ and one {\em IBlock} under
keyword ``test".
+\begin{description}
+ \item[$A \to B$:]{Query: $H(Pub_{H(``test")})$}
+ \item[$B \to A$:]{Response:
$([E_{H(``test")}(Q_0,K_0,size)]_{Prv_{H(``test")}},Pub_{H(``test")})$
+%%%%\\
+ (one {\em KBlock})}
+%: the encrypted and signed data, and the public key)}
+ \item[$A \to B$:]{Query: $Q_0$ (CHK-query)}
+ \item[$B \to A$:]{Response: $E_{K_0}(Q_1, K_1, Q_2, K_2)$ (encrypted {\em
IBlock})}
+ \item[$A \to B$:]{Query: $Q_1$ and $Q_2$ (CHK-query)}
+ \item[$B \to A$:]{Response: $E_{K_1}(B_1)$ and $E_{K_2}(B_2)$ (encrypted {\em
DBlock}s)}
+\end{description}
+\vspace{2mm}
+\hrule
+\caption{Example protocol for an ECRS download. $(Q_i,K_i)$ is a CHK pair to
request and decrypt block $i$.}
+\label{protocol}
+\end{figure*}
+
+
+
+\section{Extensions} \label{extensions}
+
+The vanilla ECRS encoding scheme still leaves some practical problems
+that should be addressed to facilitate real-life usability. For
+example, the manual effort of assigning or guessing keywords should be
+minimized. Also, the overall system should be efficient in practice.
+In particular, the system requires peers to frequently handle small,
+per-block queries, many of which may not have a answer that is locally
+available. The following subsections present some ideas on how these
+issues can be addressed.
+
+
+\subsection{Keyword inference} \label{keywords}
+
+One problem with ECRS is that the content must often be associated
+with keywords. Although this is vastly better than forcing the user
+to rely on ``meaningless" bitstrings as the only identifier, the keys
+must still be chosen so that the target audience can guess them. The
+simplest non-technical solution for this problem is for a group of
+users to agree on an informal standard for keywords. If content
+providers want to make it easy for others to guess a keyword, it is
+typically useful to follow informal conventions for keyword selection.
+For example, a reasonable convention may be to only use lower-case
+letters.
+
+A larger problem for a keyword-based search is that users may be
+reluctant to put in the effort to provide good keywords for the
+content that they provide. A solution to this problem is the {\tt
+libextractor} library~\cite{le2005}. {\tt libextractor} is a library
+for metadata extraction that is used to automatically extract keywords
+and other metadata, such as descriptions, comments and mime-types from
+files of various formats.
+
+
+\subsection{Directories}
+
+Another approach to avoiding searches is to group files into
+directories. Directories can help with the search problem since they
+reduce the need for searching. Also, they can be used to bundle
+similar content and thus help users avoid inappropriately labeled
+data. If several files of such a directory have appropriate
+descriptions, it is likely that the other files will also have been
+provided by a non-malicious party.
+
+Integrating directories into the ECRS scheme is fairly
+straightforward. A directory is simply a file that contains any
+number of {\em SBlock}s or {\em KBlock}s in plaintext (!). Like
+files, directories are immutable and are subjected to the same
+encoding for sharing.
+
+Note that it is possible for users to assemble a directory that refers
+to any combination of files: files the user inserted personally, files
+that the user downloaded, files that the user encountered as search
+results but never downloaded, or even invalid data (which would be
+interpreted as references that correspond to non-existent files).
+Directories can also refer to other directories, allowing users to
+build navigable structures similar to file systems or the World Wide
+Web. In particular it is possible to refer to contents of other users
+and even to files or directories that are supposed to be published in
+the future. Figure~\ref{fig:network} illustrates some of the possible
+reference relationships between the various constructs.
+
+
+\begin{figure*}[t]
+\begin{center}
+\small
address@hidden
+ *+[F]{SBlock(\underline{Alice})} {\ar@/_/[rr]} & & Directory_1
{\ar@/_/[ll]} address@hidden>}[dll]} address@hidden>}[dl]}
address@hidden>}[d]} & *+[F]{KBlock(``food")} address@hidden>}[l]} \\
+ *+[F]{SBlock(\underline{Bob})} address@hidden>}[dr]} &
*+[F]{KBlock(``soda")} address@hidden>}[d]} & *+[F]{KBlock(``soda")}
address@hidden>}[d]} & *+[F]{KBlock(``cola")} address@hidden>}[dl]} \\
+ *+[F]{KBlock(``bob")} address@hidden>}[u]} & Document_1 & Document_2 &
Document_3 \\
+}
+\caption{
+ECRS allows the formation of complicated network structures. In this
+example, the {\em SBlock} of pseudonym \underline{\it {Alice}}
+eventually allows to retrieve two of the documents encoded in the
+system, as does {\em Kblock} for keyword ``food". Boxes
+denote simple blocks that serve as entry-points. The directory and
+the documents consist of trees of possibly many CHK-encoded blocks.
+Searching for keyword ``soda" would return two results pointing
+to different resources. Note that all the encoded resources,
+including the one document with no pointers to it, can be retrieved by
+knowing the CHK keys of their root {\em IBlock}s. }
+\label{fig:network}
+\end{center}
+\end{figure*}
+
+
+\subsection{Efficient lookups with bloom filters}
+
+Given that a query only requires the transmission of a hash code, the
+number of queries that any given peer may receive is quite high. The
+bandwidth required for the response can often be discounted, since
+a peer may only be able to respond to a fraction of the
+received queries. Assuming that queries dominate the traffic, over 50
+queries per second could be transmitted over a slow modem line. Many
+peers might not be able to perform disk-based database lookups at such
+rates. Worse, if peers are sharing gigabytes of content, simply
+keeping the index information in memory is also often no longer feasible.
+
+In order to dramatically reduce the necessary number of database
+accesses, ECRS can be supplemented with a bloom filter~\cite{bloom},
+which is a probabilistic data structure that uses little memory and
+can be used to filter out queries that definitely cannot be answered
+by the local peer. The bloom filter is guaranteed to allow all
+queries that can be locally answered through the filter, and will
+reject all but a statistically insignificant number of queries that
+cannot be answered locally.
+
+The size of the bloom filter in memory that is required to reduce the
+number of false-positives to approximately 3\% is about one byte (8
+bit with 5 bloom tests, $2^{-5} \approx 3\%$) per entry. This reduces
+the memory requirements for the index by a factor of 16-64, depending
+on the size of the hash. Since a node occasionally needs to remove
+content from the local database, additional bit counters for the bloom
+filter should be stored on the disk. The assumption is that
+changes to the filter are rare compared to the frequency of queries.
+Queries that pass through the bloom filter are forwarded to the
+database layer which then attempts to locate the content.
+
+
+
+\section{Discussion} \label{discussion}
+
+The fact that each {\em DBlock} can be encoded independently from any
+other {\em DBlock} results in an important feature of ECRS called {\em
+on-demand encoding}. Given a plaintext file and an index that maps a
+query hash to an offset in the file, the resulting {\em DBlock} can be
+encoded on-the-fly, without processing any other part of the file.
+This can be an important benefit if the user intends to keep the file
+in plaintext on the local drive. In this case, the system can index
+the {\em DBlocks} without replicating the actual data completely,
+storing only the resulting {\em IBlocks} (and {\em SBlocks} and {\em
+KBlocks}) and then later producing the {\em DBlocks} only using the
+index and the original file. This can result in rather dramatic
+savings in space (no replication of encoded content).
+
+Splitting files into blocks might be perceived as having a negative
+effect on the preservation of data. If only one of the blocks is
+lost, the larger file can no longer be reconstructed. Many other
+systems~\cite{freehaven-berk,mojotech} attempt to address this problem
+by either attempting to keep files intact, or by using erasure
+codes~\cite{rabin89efficient} to patch missing pieces. While erasure
+codes could be used together with ECRS, they would conflict with the
+performance benefits of on-demand encoding. Consequently, the primary
+mechanism to guard against the loss of files encoded with ECRS should
+be data replication. Since ECRS splits files into blocks it should be
+possible for the network to duplicate blocks at a negligible cost per
+block. Duplicating a complete file of several gigabytes would be much
+more costly and more likely to fail. For large files, it may be
+difficult for a peer to find individual hosts that are willing (or
+able) to provide enough space to replicate the complete file in its
+entirety. Also, the traffic burst that a large transfer would impose
+on the network might keep the participating nodes busy for too long.
+Blocks, on the other hand, can migrate quickly from host to host.
+Storing a large file on a single host also fails to facilitate
+distribution of load for downloading purposes.
+
+
+\subsection{Attacks}
+
+ECRS is open to two types of attacks from censors. The most obvious
+attack is to guess keywords and use those to compute queries for
+specific {\em KBlock}s. The adversary can then try to censor these
+queries. Since the same content can be available under many keywords,
+this technique is not necessary successful. However, this guessing
+attack does provide the opportunity for limited forms of censorship.
+An adversary could create a ``blacklist" of keywords and attempt to
+legally force operators to filter matching queries or replies.
+
+Instead of predicting keywords, the attacker can also try to obtain
+the exact contents of the file (or at least the exact contents of an
+incriminating part). This maybe achieved by searching the network for
+certain keywords and then downloading the resulting content. This way
+the attacker can again compute the query hash for the {\em DBlock}s and
+{\em IBlock}s and also obtain the encrypted {\em DBlock}s and {\em
+IBlock}s themselves. Again, the adversary can then try to censor this
+data. Note that this attack requires the adversary to obtain a copy
+of the content and then exercise a certain amount of control over the
+peers in the network. As users must have a way to decrypt the file
+solely by means of guessing the keyword, this attack cannot be
+avoided. A fault-tolerant peer-to-peer routing protocol may be able
+to route the content around the censoring peers.
+
+If such an active censorship attack is known to occur on a large
+scale, a possible defense would be to publish the content with slight
+alterations for each keyword. A single space inserted at the
+beginning of a text-document is sufficient to change {\em all} blocks
+of the ECRS encoding.\footnote{Note that only operations causing
+global shifts in the data have this property. One single-character
+replacement changes only one root-to-leaf path in the encoding tree.}
+While this would defeat the use of convergent encryption and increase
+the storage and bandwidth requirements, this would make it infeasible
+for the censor to effectively censor all of the variants. Since such
+a powerful active attacker is likely to be uncommon, the {\em default}
+in ECRS is to use convergent encryption.
+
+Both attacks fail to enable intermediaries to exercise editorial
+control over content in general. While peers can theoretically be
+forced to censor well-known keywords and files, they are unable to
+censor new keywords or unknown content. As small changes to the
+content or keyword are sufficient to make detection impossible, these
+types of censorship should be impractical.
+
+Another serious type of attack is spamming the global keyword space
+with useless content. Popular keywords are an easy target since they
+are by nature easily guessed. Name\-spaces can theoretically eliminate
+this problem, however they create a new difficulty in assessing which
+pseudonyms represent users that provide valuable content. A secure
+reputation system, like Advogato~\cite{levien03advogato}, may be a
+step towards a technical solution for this problem. A possibly more
+important challenge for future work is making such complex solutions
+easily accessible for the average user.
+
+
+%
+% Another or complementary direction might be some sort of pagerank
+% style ranking of search results (if possible to pull off
+% distributedly)... just a thought. I mean, suppose everyone trusts
+% and likes "Jeff". After all, Jeff inserted a billion of britney spears
+% pictures. Now its still a bit difficult to find out which of
+% those pictures are really good ones! -jtl
+%
+% ! + Content availability measuring! In a way its related to encoding,
+% just as querying is. The question is: can there be any secure
+% mechanism to measure if all blocks of a file exists in the network.
+% I think this pretty important. Pseudonyms are an informal
+% move towards this direction too. -- jtl
+% : I don't quite see what this has to do specifically with the encoding.
+% It has more to do with replication and routing, which are off-topic. -- cg
+% ! The point of future directions is precisely what it says. If there
+% is no future work left in encoding, we should point people to the
+% remaining problems w.r.t. the bigger concept. Besides, the paper
+% somewhat tries to give the impression 'look, this here can be seen
+% as an encoding problem'. What you are basically claiming
+% by 'off topic' is that there can be no trick that would connect
+% or require connecting content availability measuring to the
+% encoding that the data is represented in. For example, an
+% encoding that would allow an incremental counter to be
+% incremented *once* by anyone who has decrypted the block,
+% would be a technique related to the encoding. I'm not
+% saying that such technique would be feasible or would work,
+% what I'm saying that something similar, if possible impossible,
+% would belong to the encoding domain. -jtl
+% : Ok, so maybe we should tackle this together with the point of
+% many other systems using erasure codes to ``heal" lost portions
+% of files. We say, replication is the solution, but obviously
+% replication requires control over what gets replicated when;
+% measuring availability is one thing that can help control
+% replication. Interestingly, there is another way:
+% http://gnunet.org/papers/p2pmulti.pdf
+% So we should also: \cite{cohen02replication}
+% \nocite{cohen02replication} % for now
+
+
+\subsection{{\em KBlocks} or triple-hash}
+
+The triple-hash that was used instead of {\em KBlock}s in our earlier
+work ~\cite{esed} allows for an attack by an active, participating
+adversary. The following paragraphs first briefly present the original
+scheme and discuss the attack, and then compare it with the {\em KBlock}
+approach taken in this paper.
+
+Let an {\em RBlock} be a new kind of block that also contains the
+metadata of a file (including the top CHK data). The only difference
+between {\em RBlock}s and {\em KBlock}s is that {\em RBlock}s are
+encrypted and requested using the following triple-hash scheme. For
+each keyword $k$, the {\em RBlock} $R$ is encrypted with $H(k)$ and
+stored as the pair $\{H(H(k)), E_{H(k)}(R)\}$. Using the keyword as
+the source for the key allows the receiver of the file to obtain the
+key by guessing.
+
+Querying for an {\em RBlock} is {\bf not} straightforward. The
+problem is that the intuitive choice for a query hash, $H(H(k))$ does not
+give intermediaries a way to verify that the (encrypted) response is
+correct. Instead of using $H(H(k))$, the initiator sends the
+so-called {\em triple-hash} query $H(H(H(k)))$. A peer that has stored
+$E_{H(k)}(R)$ under $H(H(k))$ can match the query hash with the response
+and send back the pair $\{H(H(k)), E_{H(k)}(R)\}$. Intermediaries can
+verify that the proof of authenticity, $H(H(k))$, hashes to the query
+$H(H(H(k)))$. Malicious peers cannot construct the proof $H(H(k))$
+without guessing $k$ or inverting the hash function.
+
+The problem with the triple-hash is that an adversary that is routing
+a response to a triple-hash request can substitute the encrypted
+content in the $\{H(H(k)), E_{H(k)}(CHK, size)\}$ response while
+maintaining the $H(H(k))$ token. The resulting reply $\{H(H(k)), X\}$
+still looks like a valid response to the triple-hash query
+$H(H(H(k)))$. The triple-hash thus does not protect against such a
+substitution attack by an intermediary. The impact of the attack is
+such that the network would propagate and possibly cache the invalid
+replies. The attack will not prevent the spread of valid replies
+through other routes in the system since multiple results to the same
+query are possible. Furthermore, any user searching for $K$ will not
+see the invalid results. The reason is that the attempt to decrypt
+$X$ with $H(K)$ will (with high probability) result in a malformed
+{\em RBlock}. Thus, the end-user is still protected from this type of
+spam. Nevertheless, the adversary can abuse network resources in the
+form of transmission and caching of invalid data.
+
+Replacing the triple-hash with {\em KBlock}s for ECRS comes at a
+relatively high price. Where the triple-hash only requires a simple
+hash operation to verify replies, {\em KBlock}s need to perform a
+public key operation. Worse, when publishing content or searching,
+the triple-hash scheme again only requires a few quick hash operations
+to compute the query or the content. With {\em KBlock}s, the cost
+increases to additionally generating a public-private key pair in
+addition to a public key operation and hash operations.
+
+Both {\em KBlocks} and the triple-hash are vulnerable to the guessing
+attack. Guessing is slightly easier for the triple-hash since the
+computation for each guess is much cheaper. Overall, {\em KBlocks}
+work better than the triple-hash against adversaries that
+indiscriminately attempt to abuse network resources, but at the
+expense of higher CPU utilization even in the absence of an attack.
+Thus, using the triple-hash scheme may still be reasonable in networks
+with limited CPU power or less stringent security requirements.
+
+
+
+\section{Conclusion} \label{conclusion}
+
+This paper has described an encoding scheme which hides shared data
+from intermediaries. The encoding uses convergent encryption, allows
+swarming and produces a ciphertext that is not significantly larger
+than the plaintext. Individual blocks of the ciphertext can be
+generated from plaintext without reading unrelated parts of the
+original. While dictionary attacks on the keywords or known plaintext
+attacks on the content are still possible, they are harmless with
+respect to the goal of deniability for intermediaries. The basic
+encoding scheme can be extended with directories and name\-spaces.
+Name\-spaces allow for files and directories to be updated. Using
+$K$-deterministic public-private keys for signing content it is
+possible to verify search results in a global keyword space.
+
+ECRS is implemented as a part of {\sc gnu}net, a secure platform for
+peer-to-peer networking. In {\sc gnu}net, ECRS works towards
+implementing anonymous, censorship-resistant file-sharing. {\sc
+gnu}net is free software and part of the GNU project. The {\sc
+gnu}net code is approximately 100,000 lines of C code. ECRS itself is
+implemented in about 8,000 LOC. The code is freely available from the
+{\sc gnu}net webpage\footnote{\url{http://gnunet.org/}}.
+
+\subsection*{Acknowledgements}
+
+The authors thank Roger Dingledine for helpful comments on an earlier
+draft of this paper.
+
+
+{\small
+\bibliographystyle{plain}
+\bibliography{ref}
+}
+
+\end{document}
Modified: gnunet-gtk/src/common/helper.c
===================================================================
--- gnunet-gtk/src/common/helper.c 2006-10-23 00:32:41 UTC (rev 3546)
+++ gnunet-gtk/src/common/helper.c 2006-10-23 22:24:56 UTC (rev 3547)
@@ -375,6 +375,8 @@
struct GC_Configuration * c,
void * callback) {
char * load;
+ char * path;
+ char * filename;
ectx = e;
cfg = c;
@@ -384,13 +386,19 @@
saveCallsUp = YES;
/* load the interface */
-#ifdef MINGW
+ path = os_get_installation_path(IPK_DATADIR);
+ filename = MALLOC(strlen(path) + strlen("/../gnunet-gtk/gnunet-gtk.glade") +
2);
+ strcpy(filename, path);
+ FREE(path);
+ strcat(filename, "/../gnunet-gtk/gnunet-gtk.glade");
+#if MINGW
gladeFile = MALLOC(_MAX_PATH + 1);
- plibc_conv_to_win_path(PACKAGE_DATA_DIR"/gnunet-gtk.glade",
+ plibc_conv_to_win_path(filename,
gladeFile);
#else
- gladeFile = STRDUP(PACKAGE_DATA_DIR"/gnunet-gtk.glade");
+ gladeFile = STRDUP(filename);
#endif
+ FREE(filename);
mainXML = glade_xml_new(gladeFile,
"mainWindow",
Modified: gnunet-gtk/src/core/main.c
===================================================================
--- gnunet-gtk/src/core/main.c 2006-10-23 00:32:41 UTC (rev 3546)
+++ gnunet-gtk/src/core/main.c 2006-10-23 22:24:56 UTC (rev 3547)
@@ -98,7 +98,6 @@
GNUNET_fini(ectx, cfg);
return -1;
}
-
#ifdef WINDOWS
if (!debug_mode)
FreeConsole();
Modified: gnunet-gtk/src/plugins/daemon/Makefile.am
===================================================================
--- gnunet-gtk/src/plugins/daemon/Makefile.am 2006-10-23 00:32:41 UTC (rev
3546)
+++ gnunet-gtk/src/plugins/daemon/Makefile.am 2006-10-23 22:24:56 UTC (rev
3547)
@@ -15,6 +15,7 @@
@GTK_LIBS@ @GNUNETGTK_LIBS@ \
$(top_builddir)/src/common/libgnunetgtk_common.la \
-lgnunetutil \
+ -lgnunetutil_cron \
-lgnunetgetoption_api
libgnunetgtkmodule_daemon_la_LDFLAGS = \
-export-dynamic -avoid-version -module
Modified: gnunet-gtk/src/plugins/fs/Makefile.am
===================================================================
--- gnunet-gtk/src/plugins/fs/Makefile.am 2006-10-23 00:32:41 UTC (rev
3546)
+++ gnunet-gtk/src/plugins/fs/Makefile.am 2006-10-23 22:24:56 UTC (rev
3547)
@@ -26,7 +26,10 @@
-lgthread-2.0 \
-lextractor \
-lgnunetutil \
+ -lgnunetcollection \
-lgnunetfsui \
+ -lgnunetnamespace \
+ -lgnuneturitrack \
-lgnunetecrs
libgnunetgtkmodule_fs_la_LDFLAGS = \
-export-dynamic -avoid-version -module
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- [GNUnet-SVN] r3547 - GNUnet/src/util/boot GNUnet/src/util/config_impl GNUnet-docs/papers/ecrs gnunet-gtk/src/common gnunet-gtk/src/core gnunet-gtk/src/plugins/daemon gnunet-gtk/src/plugins/fs,
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