[Resource Topic] 2013/756: A Meet-in-the-Middle Attack on Round-Reduced mCrypton Using the Differential Enumeration Technique

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Title:
A Meet-in-the-Middle Attack on Round-Reduced mCrypton Using the Differential Enumeration Technique

Authors: Yonglin Hao, Dongxia Bai, Leibo Li

Abstract:

This paper describes a meet-in-the-middle (MITM) attack against the round reduced versions of the block cipher mCrypton-64/96/128. We construct a 4-round distinguisher and lower the memory requirement from 2^{100} to 2^{44} using the differential enumeration technique. Based on the distinguisher, we launch a MITM attack on 7-round mCrypton-64/96/128 with complexities of 2^{44} 64-bit blocks and 2^{57} encryptions. Then we extend the basic attack to 8 rounds for mCrypton-128 by adding some key-bridging techniques. The 8-round attack on mCrypton-128 requires a time complexity 2^{100} and a memory complexity 2^{44}. Furthermore, we construct a 5-round distinguisher and propose a MITM attack on 9-round mCrypton-128 with a time complexity of 2^{115} encryptions and a memory complexity of 2^{113} 64-bit blocks.

ePrint: https://eprint.iacr.org/2013/756

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