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Improved Linear Cryptanalysis of reduced-round SIMON-32 and SIMON-48
RISE., Swedish ICT, SICS.
Sharif University of Technology, Iran.
DTU Technical University of Denmark, Denmark.
Sharif University of Technology, Iran.
Vise andre og tillknytning
2015 (engelsk)Inngår i: Progress in Cryptology -- INDOCRYPT 2015, 2015, Vol. 9462, s. 153-179Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In this paper we analyse two variants of SIMON family of light-weight block ciphers against linear cryptanalysis and present the best linear cryptanalytic results on these variants of reduced-round SIMON to date. We propose a time-memory trade-off method that finds differential/linear trails for any permutation allowing low Hamming weight differential/linear trails. Our method combines low Hamming weight trails found by the correlation matrix representing the target permutation with heavy Hamming weight trails found using a Mixed Integer Programming model representing the target differential/linear trail. Our method enables us to find a 17-round linear approximation for SIMON-48 which is the best current linear approximation for SIMON-48. Using only the correlation matrix method, we are able to find a 14-round linear approximation for SIMON-32 which is also the current best linear approximation for SIMON-32. The presented linear approximations allow us to mount a 23-round key recovery attack on SIMON-32 and a 24-round Key recovery attack on SIMON-48/96 which are the current best results on SIMON-32 and SIMON-48. In addition we have an attack on 24 rounds of SIMON-32 with marginal complexity.

sted, utgiver, år, opplag, sider
2015. Vol. 9462, s. 153-179
Serie
Lecture Notes in Computer Science (LNCS), ISSN 0302-9743, E-ISSN 1611-3349 ; 9462
Emneord [en]
SIMON, Linear cryptanalysis, Linear hull, Correlation matrix, Mixed Integer Programming (MIP)
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-30113DOI: 10.1007/978-3-319-26617-6_9ISBN: 978-3-319-26616-9 (tryckt)ISBN: 978-3-319-26617-6 (digital)OAI: oai:DiVA.org:ri-30113DiVA, id: diva2:1128115
Konferanse
16th International Conference on Cryptology in India (INDOCRYPT 2015), December 6-9, 2015, Bangalore, India
Tilgjengelig fra: 2017-07-21 Laget: 2017-07-21 Sist oppdatert: 2019-07-11bibliografisk kontrollert

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