Cryptology ePrint Archive: Report 2020/1072

Cryptanalysis of the permutation based algorithm SpoC

Liliya Kraleva and Raluca Posteuca and Vincent Rijmen

Abstract: In this paper we present an analysis of the SpoC cipher, a second round candidate of the NIST Lightweight Crypto Standardization process. First we present a differential analysis on the sLiSCP-light permutation, a core element of SpoC. Then we propose a series of attacks on both versions of SpoC, namely round-reduced differential tag forgery and message recovery attacks, as well as a time-memory trade-off key-recovery attack on the full round version of Spoc-64. Finally, we present an observation regarding the constants used in the sLiSCP-light permutation. To the best of our knowledge, this paper represents the first third-party analysis on both SpoC cipher and the sLiSCP-light permutation.

Category / Keywords: secret-key cryptography / SpoC and sLiSCP permutation and lightweight and differential cryptanalysis and TMTO attack and NIST lightweight competition and lwc

Date: received 4 Sep 2020

Contact author: lkraleva at esat kuleuven be,raluca posteuca@esat kuleuven be

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Version: 20200909:064322 (All versions of this report)

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