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- W2949478052 abstract "AES-based functions have attracted of a lot of analysis in the recent years, mainly due to the SHA-3 hash function competition. In particular, the rebound attack allowed to break several proposals and many improvements/variants of this method have been published. Yet, it remained an open question whether it was possible to reach one more round with this type of technique compared to the state-of-the-art. In this article, we close this open problem by providing a further improvement over the original rebound attack and its variants, that allows the attacker to control one more round in the middle of a differential path for an AES-like permutation. Our algorithm is based on lists merging as defined in [21] and we generalized the concept to non-full active truncated differential paths [25]. As an illustration, we applied our method to the internal permutations used in Grostl, one of the five finalist hash functions of the SHA-3 competition. When entering this final phase, the designers tweaked the function so as to thwart attacks from Peyrin [24] that exploited relations between the internal permutations. Until our results, no analysis was published on Grostl and the best results reached 8 and 7 rounds for the 256-bit and 512-bit version respectively. By applying our algorithm, we present new internal permutation distinguishers on 9 and 10 rounds respectively." @default.
- W2949478052 created "2019-06-27" @default.
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- W2949478052 date "2014-01-01" @default.
- W2949478052 modified "2023-10-14" @default.
- W2949478052 title "Improved Cryptanalysis of AES-like Permutations" @default.
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