Cryptology ePrint Archive: Report 2016/535

Impossible Differential Cryptanalysis of Midori

Chen Zhan and Wang Xiaoyun

Abstract: Midori is a light weight block cipher recently presented by Banik et al in ASIACRYPT 2015. There are two versions of Midori with state sizes of 64-bit and 128-bit respectively. The round function is based on Substitution-Permutation Network(SPN). In this paper, we give impossible differential cryptanalysis of Midori64. We studied the non-linear layer of the cipher and give two useful properties. We also find the first 6- round impossible differential paths with two non-zero and equal input cells and one non-zero output cell, and then mount 10-round attack. This is the first impossible differential attack on Midori.

Category / Keywords: public-key cryptography / light weight block ciphers, impossible differential cryptanalysis.

Original Publication (with minor differences): ICMAE2016

Date: received 30 May 2016

Contact author: z-chen14 at mails tsinghua edu cn

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Version: 20160531:070045 (All versions of this report)

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