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New Impossible Differential Attacks on Camellia

  • Dongxia Bai
  • Leibo Li
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7232)

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 2123.8, 2121.7, 2171.4 and 2238.3 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.

Keywords

Camellia Impossible Differential Cryptanalysis Impossible Differential Attack 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Dongxia Bai
    • 1
  • Leibo Li
    • 2
    • 3
  1. 1.Department of Computer Science and TechnologyTsinghua UniversityBeijingChina
  2. 2.Key Laboratory of Cryptologic Technology and Information Security, Ministry of EducationShandong UniversityJinanChina
  3. 3.School of MathematicsShandong UniversityJinanChina

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