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RE: MD5 Collisions and Evidence Integrity

Subject: RE: MD5 Collisions and Evidence Integrity
Date: Mon, 15 Nov 2004 20:33:58 +0100

Even worse, if the alteration was intentional, there's  known *fast*
algorithms
for creating a new plaintext with the same CRC-32.  Basically, you use the
same
algorithm that is used for *every single* packet transmitted on the
Internet,
as specified in RFC1141/1624.  I don't know of any routers that *don't*
update
the IP checksums in hardware.

Exactly my point. The reason for using hashing in computer forensics is to
be able to prove that that the evidence is unchanged; intentional or
unintentional. If it is possible to make intentional changes and still end
up with the same hash sum, then the algorithm is too weak.

As stated in my previous post, I do not think MD5 is there yet.

--
Svein Y. Willassen, M.Sc.
Special investigator, Norwegian National Computer Crime Center

 


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