Cryptology ePrint Archive: Report 2021/674

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

Jinyu Lu and Yunwen Liu and Tomer Ashur and and 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.

Category / Keywords: secret-key cryptography / Rotational-XOR Cryptanalysis, Simeck, Simon, Key-expansion Algorithm

Date: received 23 May 2021

Contact author: univerlyw at hotmail com, tomer ashur at esat kuleuven be

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Version: 20210525:070933 (All versions of this report)

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