Finding Impossible Differentials for Rijndael-like and 3D-like Structures

• Ting Cui,
• Chen-hui Jin,

Vol. 7, No. 3, March 30, 2013
10.3837/tiis.2013.03.006, Download Paper (Free):

• block cipher
• impossible differential
• Rijndael structure
• 3D structure.

Abstract

Impossible Differential Cryptanalysis (IDC) uses impossible differentials to discard wrong subkeys for the first or the last several rounds of block ciphers. Thus, the security of a block cipher against IDC can be evaluated by impossible differentials. This paper studies impossible differentials for Rijndael-like and 3D-like ciphers, we introduce methods to find 4-round impossible differentials of Rijndael-like ciphers and 6-round impossible differentials of 3D-like ciphers. Using our methods, various new impossible differentials of Rijndael and 3D could be searched out.

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