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Title:
New Impossible Differential Attacks on Camellia
Authors: Dongxia Bai, Leibo Li
Abstract:Camellia is one of the most worldwide used block ciphers, which has been selected as a standard by ISO/IEC. In this paper, we propose several new 7-round impossible differentials of Camellia with 2 FL/FL^{-1} layers, which turn out to be the first 7-round impossible differentials with 2 FL/FL^{-1} layers. Combined with some basic techniques including the early abort approach and the key schedule consideration, we achieve the impossible differential attacks on 11-round Camellia-128, 11-round Camellia-192, 12-round Camellia-192, and 14-round Camellia-256, and the time complexity are 2^{123.6}, 2^{121.7}, 2^{171.4} and 2^{238.2} respectively. As far as we know, these are the best results against the reduced-round variants of Camellia. Especially, we give the first attack on 11-round Camellia-128 reduced version with FL/FL^{-1} layers.
ePrint: https://eprint.iacr.org/2011/661
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