Near-Collisions of SHA-0

Eli Biham; Rafi Chen

Paper 2004/146

Near-Collisions of SHA-0

Eli Biham and 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 rounds. This fact demonstrates that the strength of SHA-0 is not monotonous in the number of rounds.

Metadata

Available format(s): PS
Category: Secret-key cryptography
Publication info: Published elsewhere. ``Breaking News'' information on SHA-0 and SHA-1 was added to our CRYPTO 2004 paper
Keywords: SHA-0 SHA-1
Contact author(s): biham @ cs technion ac il
History: 2004-06-23: received
Short URL: https://ia.cr/2004/146
License: CC BY

BibTeX

@misc{cryptoeprint:2004/146,
      author = {Eli Biham and Rafi Chen},
      title = {Near-Collisions of {SHA}-0},
      howpublished = {Cryptology {ePrint} Archive, Paper 2004/146},
      year = {2004},
      url = {https://eprint.iacr.org/2004/146}
}