[Resource Topic] 2020/1072: Cryptanalysis of the permutation based algorithm SpoC

Welcome to the resource topic for 2020/1072

Title:
Cryptanalysis of the permutation based algorithm SpoC

Authors: Liliya Kraleva, Raluca Posteuca, 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.

ePrint: https://eprint.iacr.org/2020/1072

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