Cryptology ePrint Archive: Report 2014/448

Improved Differential Attacks on Reduced SIMON Versions

Ning Wang, Xiaoyun Wang, Keting Jia, Jingyuan Zhao

Abstract: SIMON is a family of lightweight block ciphers which are designed by the U.S National Security Agency in 2013. In this paper, we improve the previous differential attacks on SIMON family of block ciphers by considering some bit-difference equations. Combining with some new observations on key guess policies of SIMON family, we mount differential attacks on 21-round SIMON32/64, 22-round SIMON$48/72$, 22-round SIMON48/96, 28-round SIMON$64/96$ and SIMON$64/128$ with time complexity about $2^{46}$, $2^{63}$, $2^{71}$, $2^{60}$ and $2^{60}$ encryptions respectively. As far as we know, these results are the best attacks on reduced-round SIMON versions.

Category / Keywords: secret-key cryptography / SIMON, lightweight block cipher, differential attack

Date: received 10 Jun 2014

Contact author: xiaoyunwang at mail tsinghua edu cn

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Version: 20140614:053926 (All versions of this report)

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