Cryptology ePrint Archive: Report 2016/066

Linear Hull Attack on Round-Reduced Simeck with Dynamic Key-guessing Techniques

Lingyue Qin and Huaifeng Chen and Xiaoyun Wang

Abstract: Simeck is a new family of lightweight block ciphers proposed by Yang $et\ al.$ in CHES'15, which has efficient hardware implementation. In this paper, we find differentials with low hamming weight and high probability for Simeck using K\"olbl's tool, then we consider the links between the differential and linear characteristic to construct linear hulls for Simeck. We give improved linear hull attack with dynamic key-guessing techniques on Simeck according to the property of the AND operation. Our best results cover Simeck 32/64 reduced to 23 rounds, Simeck 48/96 reduced to 30 rounds, Simeck 64/128 reduced to 37 rounds. Our result is the best known so far for any variant of Simeck.

Category / Keywords: Simeck, Linear Cryptanalysis, Differential Cryptanalysis, Linear Hull, Dynamic Key-guessing

Date: received 25 Jan 2016, last revised 27 Apr 2016

Contact author: qly14 at mails tsinghua edu cn

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Version: 20160427:060758 (All versions of this report)

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