Cryptology ePrint Archive: Report 2006/350
Impossible Differential Cryptanalysis of ARIA and Camellia
Wenling Wu, Wentao Zhang, and Dengguo Feng
Abstract: This paper studies the security of the block ciphers ARIA and Camellia against impossible differential cryptanalysis. Our work improves the best impossible differential cryptanalysis of ARIA and Camellia known so far. The designers of ARIA expected no impossible differentials exist for 4-round ARIA. However, we found some nontrivial 4-round impossible differentials, which may lead to a possible attack on 6-round ARIA. Moreover, we found some nontrivial 8-round impossible differentials for Camellia, whereas only 7-round
impossible differentials were previously known. By using the
8-round impossible differentials, we presented an attack on
12-round Camellia without $FL/FL^{-1}$ layers.
Category / Keywords: secret-key cryptography /
Date: received 18 Oct 2006
Contact author: wwl at is iscas ac cn
Available format(s): PDF | BibTeX Citation
Version: 20061020:101731 (All versions of this report)
Short URL: ia.cr/2006/350
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