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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Super-Sbox Cryptanalysis: Improved Attacks for AES-Like Permutations
verfasst von : Henri Gilbert, Thomas Peyrin
Erschienen in: Fast Software Encryption
Verlag: Springer Berlin Heidelberg
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In this paper, we improve the recent rebound and start-from-the-middle attacks on
AES
-like permutations. Our new cryptanalysis technique uses the fact that one can view two rounds of such permutations as a layer of big Sboxes preceded and followed by simple affine transformations. The big Sboxes encountered in this alternative representation are named Super-Sboxes. We apply this method to two second-round
SHA-3
candidates
Grøstl
and
ECHO
, and obtain improvements over the previous cryptanalysis results for these two schemes. Moreover, we improve the best distinguisher for the
AES
block cipher in the known-key setting, reaching 8 rounds for the 128-bit version.