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Title:
New Impossible Differential Attacks of Reduced-Round Camellia-192 and Camellia-256
Authors: Jiazhe Chen, Keting Jia, Hongbo Yu, Xiaoyun Wang
Abstract:Camellia is a block cipher selected as a standard by ISO/IEC, which has been analyzed by a number of cryptanalysts. In this paper, we propose several 6-round impossible differential paths of Camellia with the FL/FL^{-1} layer in the middle of them. With the impossible differential and a well-organized precomputational table, impossible differential attacks on 10-round Camellia-192 and 11-round Camellia-256 are given, and the time complexity are 2^{175} and 2^{206.8} respectively. An impossible differential attack on 15-round Camellia-256 without FL/FL^{-1} layers and whitening is also be given, which needs about 2^{236.1} encryptions. To the best of our knowledge, these are the best cryptanalytic results of Camellia-192/-256 with FL/FL^{-1} layers and Camellia-256 without FL/FL^{-1} layers to date.
ePrint: https://eprint.iacr.org/2011/017
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