International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 05 May 2015

Alex Biryukov, Ivica Nikolic
ePrint Report ePrint Report
In this paper, we propose related-key differential distinguishers based on the complementation property of Feistel ciphers. We show that with relaxed requirements on the complementation, i.e. the property does not have to hold for all keys and the complementation does not have to be on all bits, one can obtain a variety of distinguishers. We formulate criteria sufficient for attacks based on the complementation property. To stress the importance of our findings we provide analysis of the \\textit{full-round} primitives:

* For the hash mode of \\camo without $FL,FL^{-1}$ layers, differential multicollisions with $2^{112}$ time

* For GOST, practical recovery of the full key with 31 related keys and $2^{38}$ time/data

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