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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Improving the Efficiency of Impossible Differential Cryptanalysis of Reduced Camellia and MISTY1
verfasst von : Jiqiang Lu, Jongsung Kim, Nathan Keller, Orr Dunkelman
Erschienen in: Topics in Cryptology – CT-RSA 2008
Verlag: Springer Berlin Heidelberg
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We observe that when conducting an impossible differential cryptanalysis on Camellia and MISTY1, their round structures allow us to partially determine whether a candidate pair is useful by guessing only a small fraction of the unknown required subkey bits of a relevant round at a time, instead of guessing all of them at once. Taking advantage of the early abort technique, we improve a previous impossible differential attack on 6-round MISTY1 without the FL functions, and present impossible differential cryptanalysis of 11-round Camellia-128 without the FL functions, 13-round Camellia-192 without the FL functions and 14-round Camellia-256 without the FL functions. The presented results are better than any previously published cryptanalytic results on Camellia and MISTY1 without the FL functions.