[Resource Topic] 2022/1158: Differential Cryptanalysis of K-Cipher

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Differential Cryptanalysis of K-Cipher

Authors: Mohammad Mahzoun, Liliya Kraleva, Raluca Posteuca, Tomer Ashur


K-Cipher is an ultra-low latency block cipher with variable-length parameters designed by Intel Labs. In this work, we analyze the security of K-Cipher and propose a differential cryptanalysis attack with the complexity of 2^{29.7} for a variant of K-Cipher with state size n=24 bits state and block size m=8 bits. Our attack recovers the secret key and secret randomizer values with a total length of 240 bits in \sim 30 minutes on a standard desktop machine. We show that it is possible to extend the same attack for an arbitrary set of parameters.

ePrint: https://eprint.iacr.org/2022/1158

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