The Keccak sponge function family

Guido Bertoni1, Joan Daemen1,2, Michaël Peeters1 and Gilles Van Assche1

1STMicroelectronics
2Radboud University

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The figures above are available under the Creative Commons Attribution license. In short, they can be freely used, provided that attribution is properly done in the figure caption, either by linking to this webpage or by citing the article where the particular figure first appeared.

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Keccak Crunchy Crypto Collision and Pre-image Contest

16 June 2011

After four rounds of Keccak cryptanalysis prizes, we now take an initiative that solicits attacks relevant in a hash function setting: the Keccak Crunchy Crypto Collision and Pre-image Contest. In particular, we hand out money prizes for pre-images of published images and collisions for a set of reduced-round members of the Keccak family.

In total we present challenges for 48 reduced-round Keccak instances, namely Keccak[c=160, r=b-c] with b ≥ 200:

For each of these Keccak instances there are two challenges, so 96 in total:

We have released KeccakTools v3.1, which contains support for the validation of solutions (see file KeccakCrunchyContest.cpp).

Please visit the Keccak Crunchy Crypto Contest page for the contest rules and pre-image challenges.