[Resource Topic] 2023/1302: Revisiting the Differential Meet-In-The-Middle Cryptanalysis

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Revisiting the Differential Meet-In-The-Middle Cryptanalysis

Authors: Ling Song, Qianqian Yang, Huimin Liu


The differential meet-in-the-middle (MITM) attack is a new cryptanalysis technique proposed at Crypto 2023 recently. It led to greatly improved attacks on round-reduced SKINNY-128-384 and AES-256. In this paper, we revisit the differential MITM attack and propose several variants by absorbing techniques widely used in the classical differential attack. In particular, we present a new differential MITM attack that generalizes the basic differential MITM attack in several aspects. As for applications, we make refinements to the 24-round attack on SKINNY-128-384; on 12-round AES-256, we show that the classical differential attack and the generalized differential MITM attack perform better than the basic differential MITM attack.

ePrint: https://eprint.iacr.org/2023/1302

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