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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Finding SHA-1 Characteristics: General Results and Applications
verfasst von : Christophe De Cannière, Christian Rechberger
Erschienen in: Advances in Cryptology – ASIACRYPT 2006
Verlag: Springer Berlin Heidelberg
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The most efficient collision attacks on members of the SHA family presented so far all use complex characteristics which were manually constructed by Wang
et al
. In this report, we describe a method to search for characteristics in an automatic way. This is particularly useful for multi-block attacks, and as a proof of concept, we give a two-block collision for 64-step SHA-1 based on a new characteristic. The highest number of steps for which a SHA-1 collision was published so far was 58. We also give a unified view on the expected work factor of a collision search and the needed degrees of freedom for the search, which facilitates optimization.