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Wierd issue with md5sum.
From: |
Jon Larabee |
Subject: |
Wierd issue with md5sum. |
Date: |
Sun, 10 Oct 2004 20:30:14 -0400 (EDT) |
Hi there,
Just a while ago, I noticed a strange behavior in md5sum (frankly it
scared the crap out of me), which made me think at first that my machine
had been compromised, however I am fairly certain this is not the case.
What it was, was that I use md5sum a lot to make checksums of things, and
often I do it on an ascii based, fairly critical file of mine. What I have
noticed, that after I login the first time (always after I login never
after I have let it sit awhile), if I do md5sum, the checksum will appear
completely correct except a 'c' will prepend it. I obviously thought that
there was something wrong here and my first gut reaction was go check the
version it was 5.2.1. This puzzled me, and I thought perhaps I had a
compromised binary. I decided to do the following then. I downloaded the
coreutils package from a good slackware site (slackware ten) and used the
md5sum binary to check my own binary. They matched. I then checked it the
other way. Still matched. I checked each one against itself, they
matched. Therefore, I am kind of wondering what else I might want to do?
Perhaps boot with a Knoppix CD, and take an md5 sum of md5sum vs the sum I
get when I take the md5 sum of the md5sum binary on the harddrive? It is
not a really terrible issue as after the first time I have this happen
(and strangely it does not happen all the time!), it works just
fine until I login again in which it may be fine, or it may prepend the
'c' charecter to the front of the checksum. Any ideas?
Thanks,
Jon
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