Cryptology ePrint Archive: Report 2019/185

Zero-Correlation Attacks on Tweakable Block Ciphers with Linear Tweakey Expansion

Ralph Ankele and Christoph Dobraunig and Jian Guo and Eran Lambooij and Gregor Leander and Yosuke Todo

Abstract: The design and analysis of dedicated tweakable block ciphers is a quite recent and very active research field that provides an ongoing stream of new insights. For instance, results of Kranz, Leander, and Wiemer from FSE 2017 show that the addition of a tweak using a linear tweak schedule does not introduce new linear characteristics. In this paper, we consider --- to the best of our knowledge --- for the first time the effect of the tweak on zero-correlation linear cryptanalysis for ciphers that have a linear tweak schedule. It turns out that the tweak can often be used to get zero-correlation linear hulls covering more rounds compared to just searching zero-correlation linear hulls on the data-path of a cipher. Moreover, this also implies the existence of integral distinguishers on the same number of rounds. We have applied our technique on round reduced versions of QARMA, MANTIS, and Skinny. As a result, we can present --- to the best of our knowledge --- the best attack (with respect to number of rounds) on a round-reduced variant of QARMA.

Category / Keywords: secret-key cryptography / Symmetric-key cryptography, tweakable block ciphers, zero-correlation, integral cryptanalysis, Qarma, Mantis, Skinny

Original Publication (in the same form): IACR-FSE-2019

Date: received 19 Feb 2019, last revised 11 Mar 2019

Contact author: ralph ankele 2015 at live rhul ac uk,christoph dobraunig@iaik tugraz at,guojian@ntu edu sg,eranlambooij@gmail com,Gregor Leander@rub de,todo yosuke@lab ntt co jp,ysktodo@gmail com

Available format(s): PDF | BibTeX Citation

Note: Fix some typos

Version: 20190311:140905 (All versions of this report)

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