Cryptology ePrint Archive: Report 2020/1089

Improved Attacks on sLiSCP Permutation and Tight Bound of Limited Birthday Distinguishers

Akinori Hosoyamada and Marķa Naya-Plasencia and Yu Sasaki

Abstract: Limited birthday distinguishers (LBDs) are widely used tools for the cryptanalysis of cryptographic permutations. In this paper we propose LBDs on several variants of the sLiSCP permutation family that are building blocks of two round 2 candidates of the NIST lightweight standardization process: SPIX and SpoC. We improve the number of rounds with respect to the previously known best results. We improve the techniques used for solving the inbound part and we relax the output conditions in order to extend the previous attacks.

The lower bound of the complexity of LBDs has been proved only against functions. In this paper, we prove for the first time the bound against permutations, which shows that the known upper bounds are tight.

Category / Keywords: secret-key cryptography / limited birthday distinguisher, sLiSCP, permutation, NIST Lightweight cryptography, rebound attack

Date: received 10 Sep 2020, last revised 15 Sep 2020

Contact author: akinori hosoyamada bh at hco ntt co jp,maria naya_plasencia@inria fr,yu sasaki sk@hco ntt co jp,hosoyamada akinori@nagoya-u jp

Available format(s): PDF | BibTeX Citation

Note: Some errors in references are corrected.

Version: 20200916:054555 (All versions of this report)

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