[GNUnet-SVN] r953 - GNUnet-docs/papers/ecrs

[grothoff]

Author: grothoff
Date: 2005-06-18 04:23:37 -0700 (Sat, 18 Jun 2005)
New Revision: 953

Modified:
   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
Log:
update

Modified: GNUnet-docs/papers/ecrs/main.dvi
===================================================================
(Binary files differ)

Modified: GNUnet-docs/papers/ecrs/main.log
===================================================================
--- GNUnet-docs/papers/ecrs/main.log    2005-06-18 10:35:54 UTC (rev 952)
+++ GNUnet-docs/papers/ecrs/main.log    2005-06-18 11:23:37 UTC (rev 953)
@@ -1,4 +1,4 @@
-This is pdfeTeX, Version 3.14159-1.10b-2.1 (Web2C 7.4.5) (format=pdflatex 
2005.5.20)  15 JUN 2005 15:05
+This is pdfeTeX, Version 3.14159-1.10b-2.1 (Web2C 7.4.5) (format=pdflatex 
2005.5.20)  17 JUN 2005 15:07
 entering extended mode
 **main.tex
 (./main.tex{/usr/share/texmf/pdftex/config/pdftex.cfg}
@@ -544,7 +544,7 @@
 Underfull \vbox (badness 2158) has occurred while \output is active []
 
  [3]
-[4] [5] [6] [7] <xymatrix 9x5 862> [8] [9] [10] [11] [12] [13] [14] [15]
+[4] [5] [6] [7] <xymatrix 9x6 932> [8] [9] [10] [11] [12] [13] [14] [15]
 [16] [17] [18] (./main.bbl [19]
 Underfull \hbox (badness 6658) in paragraph at lines 100--103
 []/cmr9/Raph Levien.  At-tack re-sis-tant trust met-rics.  Draft avail-able at
@@ -552,13 +552,13 @@
 
 [20]) [21] (./main.aux) ) 
 Here is how much of TeX's memory you used:
- 6622 strings out of 94960
- 81137 string characters out of 1182470
- 211862 words of memory out of 1000001
- 9525 multiletter control sequences out of 10000+50000
+ 6635 strings out of 94960
+ 81214 string characters out of 1182470
+ 220770 words of memory out of 1000001
+ 9538 multiletter control sequences out of 10000+50000
  13677 words of font info for 55 fonts, out of 500000 for 1000
  198 hyphenation exceptions out of 1000
- 32i,16n,27p,270b,585s stack positions out of 1500i,500n,5000p,200000b,5000s
+ 32i,14n,27p,270b,612s stack positions out of 1500i,500n,5000p,200000b,5000s
  329 PDF objects out of 300000
  96 named destinations out of 131072
  30 words of extra memory for PDF output out of 65536
@@ -584,4 +584,4 @@
 s/type1/bluesky/cm/cmr6.pfb></usr/share/texmf/fonts/type1/bluesky/cm/cmr7.pfb><
 /usr/share/texmf/fonts/type1/bluesky/cm/cmr10.pfb></usr/share/texmf/fonts/type1
 /bluesky/cm/cmbx12.pfb>
-Output written on main.pdf (21 pages, 274965 bytes).
+Output written on main.pdf (21 pages, 275568 bytes).

Modified: GNUnet-docs/papers/ecrs/main.pdf
===================================================================
(Binary files differ)

Modified: GNUnet-docs/papers/ecrs/main.ps
===================================================================
--- GNUnet-docs/papers/ecrs/main.ps     2005-06-18 10:35:54 UTC (rev 952)
+++ GNUnet-docs/papers/ecrs/main.ps     2005-06-18 11:23:37 UTC (rev 953)
@@ -11,7 +11,7 @@
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+%DVIPSSource:  TeX output 2005.06.17:1507
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-a
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 end
- 814 1201 a Black 100 x FA(Simple)40
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-(c)n(ks)f(\()p Fs(D)r(B)t(l)r(ock)s FA(s)g(and)523 1400
-y Fs(I)7 b(B)t(l)r(ock)s FA(s)41 b(are)f(CHK)i(enco)r(ded\))f(with)h
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-(ord-based)523 1500 y(searc)n(h.)p Black Black Black
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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
 (figure.1.1) cvn H.B /ANN pdfmark end
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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
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 SDict begin H.S end
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 SDict begin H.R end
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 SDict begin H.S end
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 SDict begin [ /View [/XYZ H.V] /Dest (subsection.1.3.2) cvn H.B /DEST
 pdfmark end
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+(hec)n(king)g(that)523 3721 y Fs(K)594 3733 y Fh(i)644
+3721 y FA(=)23 b Fs(H)7 b FA(\()p Fs(B)903 3733 y Fh(i)931
+3721 y FA(\).)21 b(The)f(encrypted)h(blo)r(c)n(k)f Fs(E)1822
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+3733 y Fh(i)2032 3721 y FA(\))h(can)f(b)r(e)h(uniquely)g(iden)n
+(ti\014ed)g(b)n(y)g(its)f(hash)523 3821 y Fs(Q)589 3833
+y Fh(i)649 3821 y FA(:=)33 b Fs(H)7 b FA(\()p Fs(E)939
+3833 y Fh(K)995 3841 y Fg(i)1025 3821 y FA(\()p Fs(B)1120
+3833 y Fh(i)1148 3821 y FA(\)\).)34 b(A)g(p)r(eer)f(can)g(query)g(for)g
+Fs(E)2142 3833 y Fh(K)2198 3841 y Fg(i)2228 3821 y FA(\()p
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+3833 y Fh(i)2767 3821 y FA(without)h(rev)n(ealing)523
+3920 y Fs(K)594 3932 y Fh(i)621 3920 y FA(.)39 b(Consequen)n(tly)-7
+b(,)38 b(the)h(pair)f(\()p Fs(K)1664 3932 y Fh(i)1692
+3920 y Fs(;)14 b(Q)1795 3932 y Fh(i)1822 3920 y FA(\))39
 b(can)f(b)r(e)h(used)g(to)g(retriev)n(e)e(and)i(decrypt)f
-Fs(B)3354 3841 y Fh(i)3382 3829 y FA(.)523 3929 y(In)n(termediaries)28
+Fs(B)3354 3932 y Fh(i)3382 3920 y FA(.)523 4020 y(In)n(termediaries)28
 b(can)g(v)n(erify)g(that)i(a)e(resp)r(onse)g Fs(E)2105
-3941 y Fh(K)2161 3949 y Fg(i)2192 3929 y FA(\()p Fs(B)2287
-3941 y Fh(i)2315 3929 y FA(\))h(matc)n(hes)f(a)h(query)f
-Fs(Q)3067 3941 y Fh(i)3124 3929 y FA(without)523 4029
-y(kno)n(wing)j Fs(K)926 4041 y Fh(i)953 4029 y FA(.)i(F)-7
-b(reenet)32 b([)p 0 1 0 TeXcolorrgb 1333 4029 a
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+4032 y Fh(i)2315 4020 y FA(\))h(matc)n(hes)f(a)h(query)f
+Fs(Q)3067 4032 y Fh(i)3124 4020 y FA(without)523 4120
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+b(reenet)32 b([)p 0 1 0 TeXcolorrgb 1333 4120 a
 SDict begin H.S end
  1333
-4029 a 0 1 0 TeXcolorrgb FA(5)p 0 1 0 TeXcolorrgb 1375
-3975 a
+4120 a 0 1 0 TeXcolorrgb FA(5)p 0 1 0 TeXcolorrgb 1375
+4066 a
 SDict begin H.R end
- 1375 3975 a 1375 4029 a
+ 1375 4066 a 1375 4120 a
 SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
 (cite.clark99distributed) cvn H.B /ANN pdfmark end
- 1375 4029 a Black FA(])h(uses)e(the)i
+ 1375 4120 a Black FA(])h(uses)e(the)i
 (same)f(sc)n(heme)g(to)g(encrypt)g(en)n(tire)g(\014les)h(\(not)f(just)
-523 4128 y(blo)r(c)n(ks\))27 b(and)h(the)g(authors)e(call)h(the)h(pair)
-f(\()p Fs(K)1981 4140 y Fh(i)2009 4128 y Fs(;)14 b(Q)2112
-4140 y Fh(i)2139 4128 y FA(\))28 b(a)f(con)n(ten)n(t)g(hash)g(k)n(ey)g
-(\(CHK\).)523 4290 y
+523 4219 y(blo)r(c)n(ks\))27 b(and)h(the)g(authors)e(call)h(the)h(pair)
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+(\(CHK\).)523 4385 y
 SDict begin H.S end
- 523 4290 a 523 4290 a
+ 523 4385 a 523 4385 a
 SDict begin 12 H.A end
- 523 4290 a
-523 4290 a
+ 523 4385 a
+523 4385 a
 SDict begin [ /View [/XYZ H.V] /Dest (subsection.1.3.3) cvn H.B /DEST
 pdfmark end
- 523 4290 a 79 x Fq(3.3)95 b Fi(IBlo)-5 b(cks)523
-4526 y FA(F)e(or)32 b(\014les)h(larger)e(than)h(the)i(blo)r(c)n(ksize,)
+ 523 4385 a 79 x Fq(3.3)95 b Fi(IBlo)-5 b(cks)523
+4625 y FA(F)e(or)32 b(\014les)h(larger)e(than)h(the)i(blo)r(c)n(ksize,)
 e(m)n(ultiple)h(CHK)f(k)n(eys)g(are)g(required)g(to)g(retriev)n(e)523
-4625 y(the)25 b(con)n(ten)n(t.)g(F)-7 b(or)25 b(example,)f(with)i(a)f
+4725 y(the)25 b(con)n(ten)n(t.)g(F)-7 b(or)25 b(example,)f(with)i(a)f
 (blo)r(c)n(ksize)f(of)h(32k)f(and)h(512)e(bit)j(hash)e(co)r(des,)h(a)g
-(32m)523 4725 y(\014le)f(w)n(ould)e(b)r(e)i(split)g(in)n(to)f(1024)e
-Ft(DBlo)l(cks)j Fs(B)1910 4737 y Fz(1)1948 4725 y Fs(;)14
-b(:)g(:)g(:)f(;)h(B)2195 4737 y Fz(1024)2355 4725 y FA(of)23
-b(length)h(32k)e(eac)n(h.)g(Groups)h(of)523 4825 y(up)k(to)f(256)f
+(32m)523 4825 y(\014le)f(w)n(ould)e(b)r(e)i(split)g(in)n(to)f(1024)e
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+b(:)g(:)g(:)f(;)h(B)2195 4837 y Fz(1024)2355 4825 y FA(of)23
+b(length)h(32k)e(eac)n(h.)g(Groups)h(of)523 4924 y(up)k(to)f(256)f
 (CHKs)h(are)f(assem)n(bled)g(in)n(to)h(one)g(32k)f Ft(IBlo)l(ck)p
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-4924 y(the)c(32m)g(\014le.)g(The)g(resulting)f Ft(IBlo)l(ck)p
-FA(s)i(are)e(CHK)h(encrypted)g(just)g(lik)n(e)g(the)g
-Ft(DBlo)l(cks)h FA(and)p Black Black eop end
+FA(,)j(resulting)e(in)g(four)g Ft(IBlo)l(ck)p FA(s)i(for)p
+Black Black eop end
 %%Page: 10 10
 TeXDict begin 10 9 bop 0 0 a
 SDict begin /product where{pop product(Distiller)search{pop pop pop
@@ -6880,87 +6899,89 @@
 end
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-(left.)523 548 y(F)-7 b(or)31 b(the)i(32m)e(\014le,)h(the)g(CHKs)g(for)
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-(one)e(\014nal)523 648 y(top)25 b Ft(IBlo)l(ck)p FA(.)i(The)f
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-(original)e(\014le)i(size.)523 938 y
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+(the)h(\014le)f(are)g(t)n(ypically)523 847 y(less)i(than)h(1\045)f(of)h
+(the)g(original)e(\014le)i(size.)523 1001 y
 SDict begin H.S end
- 523 938 a 523 938
-a
+ 523 1001
+a 523 1001 a
 SDict begin 12 H.A end
- 523 938 a 523 938 a
+ 523 1001 a 523 1001 a
 SDict begin [ /View [/XYZ H.V] /Dest (subsection.1.3.4) cvn H.B /DEST
 pdfmark end
- 523 938 a 90 x Fq(3.4)95 b(Finding)30
-b(\014les)523 1226 y FA(The)35 b(CHK)h(enco)r(ding)e(describ)r(ed)i(so)
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-523 1325 y(enco)r(ded)e(and)h(y)n(et)f(v)n(eri\014able)f(for)h(in)n
-(termediaries.)f(Ho)n(w)n(ev)n(er,)f(a)i(practical)g(\014le-sharing)523
-1425 y(sc)n(heme)e(needs)g(to)h(ha)n(v)n(e)e(w)n(a)n(ys)g(for)h(the)h
-(users)f(to)g(obtain)g(the)h(query)f(and)g(the)h(k)n(ey)f(that)523
-1524 y(are)f(no)n(w)h(necessary)f(in)h(order)f(to)h(retriev)n(e)f(the)i
-(enco)r(ded)f(con)n(ten)n(t.)g(While)h(out-of-band)523
-1624 y(comm)n(unication)24 b(of)h(those)g(CHK)f(k)n(eys)g(is)h
-(certainly)f(feasible,)h(an)g(in)n(tegrated)f(solution)g(is)523
-1724 y(clearly)h(desirable.)h(Related)g(w)n(ork)f(on)h(secure)g
-(indexing)g([)p 0 1 0 TeXcolorrgb 2381 1724 a
+ 523 1001 a 83 x Fq(3.4)95
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+(describ)r(ed)i(so)e(far)h(is)g(useful)h(for)f(transmitting)g(con)n
+(ten)n(t)g(that)g(is)523 1338 y(enco)r(ded)e(and)h(y)n(et)f(v)n
+(eri\014able)f(for)h(in)n(termediaries.)f(Ho)n(w)n(ev)n(er,)f(a)i
+(practical)g(\014le-sharing)523 1437 y(sc)n(heme)e(needs)g(to)h(ha)n(v)
+n(e)e(w)n(a)n(ys)g(for)h(the)h(users)f(to)g(obtain)g(the)h(query)f(and)
+g(the)h(k)n(ey)f(that)523 1537 y(are)f(no)n(w)h(necessary)f(in)h(order)
+f(to)h(retriev)n(e)f(the)i(enco)r(ded)f(con)n(ten)n(t.)g(While)h
+(out-of-band)523 1637 y(comm)n(unication)24 b(of)h(those)g(CHK)f(k)n
+(eys)g(is)h(certainly)f(feasible,)h(an)g(in)n(tegrated)f(solution)g(is)
+523 1736 y(clearly)h(desirable.)h(Related)g(w)n(ork)f(on)h(secure)g
+(indexing)g([)p 0 1 0 TeXcolorrgb 2381 1736 a
 SDict begin H.S end
- 2381 1724
-a 0 1 0 TeXcolorrgb FA(12)p 0 1 0 TeXcolorrgb 2464 1670
+ 2381 1736
+a 0 1 0 TeXcolorrgb FA(12)p 0 1 0 TeXcolorrgb 2464 1683
 a
 SDict begin H.R end
- 2464 1670 a 2464 1724 a
+ 2464 1683 a 2464 1736 a
 SDict begin [ /Color [0 1 0] /H /I /Border [0 0 0] /Subtype /Link /Dest
 (cite.secure2004goh) cvn H.B /ANN pdfmark end
- 2464 1724 a Black FA(])h(allo)n(ws)e(serv)n
-(ers)f(to)i(retriev)n(e)523 1823 y(do)r(cumen)n(ts)34
+ 2464 1736 a Black FA(])h(allo)n(ws)e(serv)n
+(ers)f(to)i(retriev)n(e)523 1836 y(do)r(cumen)n(ts)34
 b(b)n(y)f(k)n(eyw)n(ord)f(without)i(learning)e(ab)r(out)i(the)g(rest)f
-(of)h(the)g(do)r(cumen)n(t.)g(The)523 1923 y(sc)n(heme)h(that)h(will)g
+(of)h(the)g(do)r(cumen)n(t.)g(The)523 1936 y(sc)n(heme)h(that)h(will)g
 (b)r(e)g(describ)r(ed)f(in)h(Section)p 1 0 0 TeXcolorrgb
-2067 1923 a
+2067 1936 a
 SDict begin H.S end
- 2067 1923 a 1 0 0 TeXcolorrgb FA(3.6)p 1 0 0
-TeXcolorrgb 2173 1869 a
+ 2067 1936 a 1 0 0 TeXcolorrgb FA(3.6)p 1 0 0
+TeXcolorrgb 2173 1882 a
 SDict begin H.R end
- 2173 1869 a 2173 1923 a
+ 2173 1882 a 2173 1936 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
  2173
-1923 a Black 36 w FA(impro)n(v)n(es)e(on)h(this)h(b)n(y)f(k)n(eeping)g
-(the)523 2023 y(k)n(eyw)n(ord)25 b(itself)j(priv)-5 b(ate,)27
+1936 a Black 36 w FA(impro)n(v)n(es)e(on)h(this)h(b)n(y)f(k)n(eeping)g
+(the)523 2035 y(k)n(eyw)n(ord)25 b(itself)j(priv)-5 b(ate,)27
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-(op)r(eration)g(of)523 2122 y(the)e(serv)n(er)e(and)h(a)n(v)n(oiding)f
+(op)r(eration)g(of)523 2135 y(the)e(serv)n(er)e(and)h(a)n(v)n(oiding)f
 (the)i(need)g(for)f(the)h(publisher)g(to)f(encrypt)h(the)g(do)r(cumen)n
-(t)f(with)523 2222 y(the)33 b(public)g(k)n(ey)f(of)h(a)f
+(t)f(with)523 2234 y(the)33 b(public)g(k)n(ey)f(of)h(a)f
 Ft(sp)l(e)l(ci\014c)i FA(receiv)n(er,)d(thereb)n(y)h(theoretically)g(p)
-r(ermitting)h(access)e(to)523 2321 y(the)h(same)f(encrypted)g(con)n
+r(ermitting)h(access)e(to)523 2334 y(the)h(same)f(encrypted)g(con)n
 (ten)n(t)g(to)h(arbitrary)d(participan)n(ts)h(\(as)i(long)e(as)h(they)h
-(are)e(able)523 2421 y(to)e(obtain)f(or)g(guess)f(the)i(necessary)e(k)n
-(eyw)n(ord\).)648 2527 y(The)e(k)n(ey)g(problem)g(for)g(the)h(searc)n
+(are)e(able)523 2434 y(to)e(obtain)f(or)g(guess)f(the)i(necessary)e(k)n
+(eyw)n(ord\).)648 2533 y(The)e(k)n(ey)g(problem)g(for)g(the)h(searc)n
 (h)e(is)h(that)h(simply)f(publishing)h(CHK)f(k)n(eys)g(in)g(plain-)523
-2627 y(text)36 b(under)g(certain)f(k)n(eyw)n(ords)f(\(as)h(done)h(in)g
+2633 y(text)36 b(under)g(certain)f(k)n(eyw)n(ords)f(\(as)h(done)h(in)g
 (F)-7 b(reenet)35 b(with)i(KSK)e(k)n(eys\))g(has)g(v)-5
-b(arious)523 2726 y(dra)n(wbac)n(ks.)24 b(First,)i(in)n(termediaries)f
+b(arious)523 2733 y(dra)n(wbac)n(ks.)24 b(First,)i(in)n(termediaries)f
 (w)n(ould)h(learn)g(ab)r(out)g(the)g(CHK)h(k)n(eys)e(that)i(they)f(are)
-523 2826 y(storing)32 b(or)g(transmitting,)h(whic)n(h)g(ma)n(y)f(allo)n
+523 2832 y(storing)32 b(or)g(transmitting,)h(whic)n(h)g(ma)n(y)f(allo)n
 (w)g(them)h(to)g(easily)f(censor)g(searc)n(h)f(results.)523
-2926 y(Second,)36 b(the)g(k)n(eyw)n(ords)d(are)i(directly)h(exp)r(osed)
+2932 y(Second,)36 b(the)g(k)n(eyw)n(ords)d(are)i(directly)h(exp)r(osed)
 f(to)h(the)g(in)n(termediaries,)e(whic)n(h)i(again)523
-3025 y(w)n(ould)31 b(facilitate)f(censorship.)g(Finally)-7
+3031 y(w)n(ould)31 b(facilitate)f(censorship.)g(Finally)-7
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-b(alid)31 b(replies)523 3125 y(that)37 b(refer)f(to)h(inappropriate)e
+b(alid)31 b(replies)523 3131 y(that)37 b(refer)f(to)h(inappropriate)e
 (con)n(ten)n(t.)h(This)h(ma)n(y)f(b)r(e)h(just)g(a)g(n)n(uisance)f(if)h
-(malicious)523 3224 y(p)r(eers)26 b(use)g(this)h(for)f(adv)n(ertising)e
+(malicious)523 3231 y(p)r(eers)26 b(use)g(this)h(for)f(adv)n(ertising)e
 (\(this)j(kind)g(of)f(b)r(eha)n(vior)f(can)h(b)r(e)h(observ)n(ed)e(on)h
-(gn)n(utella)523 3324 y(from)k(time)h(to)g(time\).)h(P)n(ossibly)c(w)n
+(gn)n(utella)523 3330 y(from)k(time)h(to)g(time\).)h(P)n(ossibly)c(w)n
 (orse,)i(if)h(a)f(net)n(w)n(ork)f(w)n(an)n(ts)h(to)g(economically)g
-(rew)n(ard)523 3424 y(p)r(eers)24 b(for)f(returning)h(searc)n(h)e
+(rew)n(ard)523 3430 y(p)r(eers)24 b(for)f(returning)h(searc)n(h)e
 (results,)i(the)g(p)r(ossibilit)n(y)g(of)g(returning)g(arbitrary)e
-(nonsense)523 3523 y(migh)n(t)28 b(mak)n(e)e(suc)n(h)i(incen)n(tiv)n(e)
+(nonsense)523 3530 y(migh)n(t)28 b(mak)n(e)e(suc)n(h)i(incen)n(tiv)n(e)
 f(sc)n(hemes)g(impractical.)648 3629 y(But)33 b(ho)n(w)g(can)g(a)g
 (system)g(prev)n(en)n(t)g(p)r(eers)g(from)g(returning)g(in)n(v)-5
 b(alid)33 b(resp)r(onses)f(to)h(a)523 3729 y(k)n(eyw)n(ord-based)g

Modified: GNUnet-docs/papers/ecrs/main.tex
===================================================================
--- GNUnet-docs/papers/ecrs/main.tex    2005-06-18 10:35:54 UTC (rev 952)
+++ GNUnet-docs/papers/ecrs/main.tex    2005-06-18 11:23:37 UTC (rev 953)
@@ -21,9 +21,6 @@
 % - try to avoid the use of ``encoding'' as a noun on its own. ``encoding
 %   scheme'' or ``encoding mechanism'' is better.
 %
-% Todo:
-% - fix xy-pic (dotted arrows, multicols)
-%
 % 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)
@@ -542,12 +539,13 @@
 \small
 address@hidden 
   &&&& KBlock\ar[d] &&&&\\
-  &&&& IBlock_{\top}\ar[dlll]\ar[d]\ar[drrr] &&&& \\
-  & IBlock_1\ar[dl]\ar[d]\ar[dr] &&& \ldots\ar[dl]\ar[d]\ar[dr] &&& 
-    IBlock_{k}\ar[dl]\ar[d]\ar[dr] & \\
-  DBlock_1\ar[d] & \ldots\ar[d] & DBlock_{l}\ar[d]&& \ldots\ar[d] 
-  && DBlock_{m}\ar[d] & \ldots\ar[d] & DBlock_{n}\ar[d] \\
-  &&&& \texttt{Original data} &&&& \\ % FIXME: put this in a box and across 
all rows!
+  &&&& 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*{4.5cm} Original data \hspace*{4.5cm}}} 
\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