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Plateau characteristics

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2 Author(s)
Daemen, J. ; STMicroelectronics, Zaventem ; Rijmen, V.

Plateau characteristics are a special type of characteristics whose probability depends on the key and can have only two values. For a (usually small) subset of the keys it has a non-zero probability and for all other keys its probability is zero. For a large group of ciphers, including the AES, all two-round characteristics are plateau characteristics. For the AES and other ciphers with a similar structure, the vast majority of characteristics over four or more rounds are plateau characteristics. In the case of the AES, for most keys, there are two-round characteristics with fixed-key probability equal to 32/2 32, whereas the maximum expected differential probability of two-round differentials is at most 13.25/232

Published in:

Information Security, IET  (Volume:1 ,  Issue: 1 )