Welcome to the resource topic for 2013/359
Title:
A heuristic for finding compatible differential paths with application to HAS-160
Authors: Aleksandar Kircanski, Riham AlTawy, Amr M. Youssef
Abstract:The question of compatibility of differential paths plays a central role in second order collision attacks on hash functions. In this context, attacks typically proceed by starting from the middle and constructing the middle-steps quartet in which the two paths are enforced on the respec- tive faces of the quartet structure. Finding paths that can fit in such a quartet structure has been a major challenge and the currently known compatible paths extend over a suboptimal number of steps for hash functions such as SHA-2 and HAS-160. In this paper, we investigate a heuristic that searches for compatible differential paths. The application of the heuristic in case of HAS-160 yields a practical second order collision over all of the function steps, which is the first practical result that covers all of the HAS-160 steps. An example of a colliding quartet is provided
ePrint: https://eprint.iacr.org/2013/359
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