Cryptology ePrint Archive: Report 2015/902

Differential Security Evaluation of Simeck with Dynamic Key-guessing Techniques

Kexin Qiao and Lei Hu and Siwei Sun

Abstract: The Simeck family of lightweight block ciphers was proposed in CHES 2015 which combines the good design components from NSA designed ciphers SIMON and SPECK. Dynamic key-guessing techniques were proposed by Wang {\it et al.} to greatly reduce the key space guessed in differential cryptanalysis and work well on SIMON. In this paper, we implement the dynamic key-guessing techniques in a program to automatically give out the data in dynamic key-guessing procedure and thus simplify the security evaluation of SIMON and Simeck like block ciphers regarding differential attacks. We use the differentials from K\"{o}lbl {\it et al.}'s work and also a differential with lower Hamming weight we find using Mixed Integer Linear Programming method to attack Simeck and improve the previously best results on all versions of Simeck by 2 rounds.

Category / Keywords: secret-key cryptography / Simeck, Dynamic Key-guessing, Differential Cryptanalysis

Date: received 16 Sep 2015

Contact author: qiaokexin at iie ac cn

Available format(s): PDF | BibTeX Citation

Version: 20150917:143643 (All versions of this report)

Short URL: ia.cr/2015/902

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