The Design of Rijndael
Differential Collisions in SHA-0
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
New local collisions for the SHA-2 hash family
ICISC'07 Proceedings of the 10th international conference on Information security and cryptology
Attacking reduced round SHA-256
ACNS'08 Proceedings of the 6th international conference on Applied cryptography and network security
A failure-friendly design principle for hash functions
ASIACRYPT'05 Proceedings of the 11th international conference on Theory and Application of Cryptology and Information Security
Analysis of step-reduced SHA-256
FSE'06 Proceedings of the 13th international conference on Fast Software Encryption
Finding collisions in the full SHA-1
CRYPTO'05 Proceedings of the 25th annual international conference on Advances in Cryptology
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In this work, we study several properties of the SHA-2 design which have been utilized in recent collision attacks against reduced round SHA-2. Small modifications to the SHA-2 design are suggested to thwart these attacks. The modified round function provides the same resistance to linearization attacks as the original SHA-2 round function, but, provides better resistance to non-linear attacks. Our next contribution is to introduce the general idea of "multiple feed-forward" for the construction of cryptographic hash functions. This can provide increased resistance to the Chabaud-Joux type "perturbation-correction" collision attacks. The idea of feed-forward is taken further by introducing the idea of feed-forward across message blocks leading to resistance against generic multi-collision attacks. The net effect of the suggested changes to the SHA-2 design has insignificant impact on the efficiency of computing the digest.