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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Collisions of SHA-0 and Reduced SHA-1
verfasst von : Eli Biham, Rafi Chen, Antoine Joux, Patrick Carribault, Christophe Lemuet, William Jalby
Erschienen in: Advances in Cryptology – EUROCRYPT 2005
Verlag: Springer Berlin Heidelberg
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In this paper we describe improvements to the techniques used to cryptanalyze SHA-0 and introduce the first results on SHA-1. The results include a generic multi-block technique that uses near-collisions in order to find collisions, and a four-block collision of SHA-0 found using this technique with complexity 2
51
. Then, extension of this and prior techniques are presented, that allow us to find collisions of reduced versions of SHA-1. We give collisions of variants with up to 40 rounds, and show the complexities of longer variants. These techniques show that collisions up to about 53–58 rounds can still be found faster than by birthday attacks.