Cryptology ePrint Archive: Report 2012/163
Differential propagation analysis of Keccak
Joan Daemen and Gilles Van Assche
Abstract: In this paper we introduce new concepts that help read and understand low-weight differential trails in Keccak. We then propose efficient techniques to exhaustively generate all 3-round trails in its largest permutation below a given weight. This allows us to prove that any 6-round differential trail in Keccak-f has weight at least 74. In the worst-case diffusion scenario where the mixing layer acts as the identity, we refine the lower bound to 82 by systematically constructing trails using a specific representation of states.
Category / Keywords: cryptographic hash function, Keccak, differential cryptanalysis, computer-aided proof
Publication Info: Full version of the paper presented at FSE 2012
Date: received 26 Mar 2012, last revised 26 Apr 2012
Contact author: gilles vanassche at st com
Available formats: PDF | BibTeX Citation
Note: Added reference to the source code.
Version: 20120426:093226 (All versions of this report)
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