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Title:
Improved Meet-in-the-Middle Attacks on Reduced-Round Camellia-192/256
Authors: Leibo Li, Keting Jia
Abstract:Camellia is one of the widely used block ciphers, which has been selected as an international standard by ISO/IEC. In this paper, we focus on the key-recovery attacks on reduced-round Camellia-192/256 with meet-in-the-middle methods. We utilize multiset and the differential enumeration methods which are popular to analyse AES in the recent to attack Camellia-192/256. We propose a 7-round property for Camellia-192, and achieve a 12-round attack with 2^{180} encryptions, 2^{113} chosen plaintexts and 2^{130} 128-bit memories. Furthermore, we present an 8-round property for Camellia-256, and apply it to break the 13-round Camellia-256 with 2^{232.7} encryptions, 2^{113} chosen ciphertexts and 2^{227} 128-bit memories.
ePrint: https://eprint.iacr.org/2014/292
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