Algebraic Cryptanalysis of Variants of Frit

Christoph Dobraunig, Maria Eichlseder*, Florian Mendel, Markus Schofnegger

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandBegutachtung


Frit is a cryptographic 384-bit permutation recently proposed by Simon et al. and follows a novel design approach for built-in countermeasures against fault attacks. We analyze the cryptanalytic security of Frit in different use cases and propose attacks on the full-round primitive. We show that the inverse of Frit is significantly weaker than Frit from an algebraic perspective, despite the better diffusion of the inverse of the mixing functions Its round function has an effective algebraic degree of only about 1.325. We show how to craft structured input spaces to linearize up to 4 (or, conditionally, 5) rounds and thus further reduce the degree. As a result, we propose very low-dimensional start-in-the-middle zero-sum partitioning distinguishers for unkeyed Frit, as well as integral distinguishers for reduced-round Frit and full-round We also consider keyed Frit variants using Even-Mansour or arbitrary round keys. By using optimized interpolation attacks and symbolically evaluating up to 5 rounds of we obtain key-recovery attacks with a complexity of either chosen plaintexts and time, or chosen ciphertexts and time (about 5 seconds in practice).

TitelSelected Areas in Cryptography – SAC 2019 - 26th International Conference, Revised Selected Papers
Redakteure/-innenKenneth G. Paterson, Douglas Stebila
Herausgeber (Verlag)Springer
ISBN (Print)9783030384708
PublikationsstatusVeröffentlicht - 10 Jan 2020
VeranstaltungSelected Areas in Cryptography - SAC 2019 - Waterloo, Kanada
Dauer: 12 Aug 201916 Aug 2019


NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Band11959 LNCS
ISSN (Print)0302-9743
ISSN (elektronisch)1611-3349


KonferenzSelected Areas in Cryptography - SAC 2019
KurztitelSAC 2019

ASJC Scopus subject areas

  • Theoretische Informatik
  • Informatik (insg.)


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