[Resource Topic] 2020/689: Single Tweakey Cryptanalysis of Reduced-Round SKINNY-64

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Title:
Single Tweakey Cryptanalysis of Reduced-Round SKINNY-64

Authors: Orr Dunkelman, Senyang Huang, Eran Lambooij, Stav Perle

Abstract:

Skinny is a lightweight tweakable block cipher which received a great deal of cryptanalytic attention following its elegant structure and efficiency. Inspired by the Skinny competitions, multiple attacks on it were reported in different settings (e.g. single vs. related-tweakey) using different techniques (impossible differentials, meet-in-the-middle, etc.). In this paper we revisit some of these attacks, identify issues with several of them, and offer a series of improved attacks which were experimentally verified. Our best attack can attack up to 18 rounds using 2^{60} chosen ciphertexts data, 2^{116} time, and 2^{112} memory.

ePrint: https://eprint.iacr.org/2020/689

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