Impossible Differential Cryptanalysis of ARIA

Abstract

Abstract: This paper studied the security of the block cipher ARIA against impossible differential cryptanalysis. By analyzing the property of the diffusion transformation, a new kind of nontrivial 6-round impossible differential was presented. Generally, considering the weigh of differential, these two different kinds of impossible differential structures and the count were proposed. Based on this, we can give out all the number of these two kinds 6-round impossible differential in theory. It is shown that, when guessing the input-and-output differential weight of 10, there are only two kinds of impossible differential and all of them can be used to attack the 6-round ARIA with the best result by now: the data complexity is 2120 chosen plaintexts, and the time complexity is 294.5 encryptions of 6-round ARIA.

Key words: cryptography, impossible differential cryptanalysis, ARIA block cipher, data complexity

CLC Number:

TN918.1

ZHANG Lei, GUO Jian-Sheng. Impossible Differential Cryptanalysis of ARIA[J]. Journal of Shanghai Jiaotong University, 2011, 45(07): 1063-1067.

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