Cryptology ePrint Archive: Report 2004/146
Near-Collisions of SHA-0
Eli Biham, Rafi Chen
Abstract: In this paper we find two near-collisions of the full compression
function of SHA-0, in
which up to 142 of the 160 bits of the output are equal.
We also find
many full collisions of 65-round reduced SHA-0, which is a large
improvement to the best previous result of 35 rounds.
We use the very
surprising fact that the messages have many neutral bits, some of
which do not affect
the differences for about 15--20 rounds.
We also show that 82-round
SHA-0 is much weaker than the (80-round) SHA-0, although it has more
This fact demonstrates that the strength of SHA-0 is not
monotonous in the number of rounds.
Category / Keywords: secret-key cryptography / SHA-0, SHA-1
Publication Info: ``Breaking News'' information on SHA-0 and SHA-1 was added to our CRYPTO 2004 paper
Date: received 22 Jun 2004
Contact author: biham at cs technion ac il
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Version: 20040623:220050 (All versions of this report)
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