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