[Resource Topic] 2021/674: On the Effect of the Key-expansion Algorithm in Simon-like Ciphers

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Title:
On the Effect of the Key-expansion Algorithm in Simon-like Ciphers

Authors: Jinyu Lu, Yunwen Liu, Tomer Ashur, Chao Li

Abstract:

In this work we investigate how the choice of the key-expansion algorithm and its interaction with the round function affect the resistance of Simon-like ciphers against rotational-XOR (RX) cryptanalysis. We observe that among the key-expansion algorithms we consider, Simon is most resistant, while Simeck is much less so. Implications on lightweight ciphers design are discussed and open questions are proposed.

ePrint: https://eprint.iacr.org/2021/674

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