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International Conference on Cryptology in India

INDOCRYPT 2015: Progress in Cryptology -- INDOCRYPT 2015 pp 140–152Cite as

Linear Cryptanalysis of Reduced-Round SIMECK Variants

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Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 9462))

Abstract

SIMECK is a family of 3 lightweight block ciphers designed by Yang et al. They follow the framework used by Beaulieu et al. from the United States National Security Agency (NSA) to design SIMON and SPECK. A cipher in this family with K-bit key and N-bit block is called SIMECKN / K. We show that the security of this block cipher against linear cryptanalysis is not as good as its predecessors SIMON. More precisely, while the best known linear attack for SIMON32/64, using Algorithm 1 of Matsui, covers 13 rounds we present a linear attack in this senario which covers 14 rounds of SIMECK32/64. Similarly, using Algorithm 1 of Matsui, we present attacks on 19 and 22 rounds of SIMECK48/96 and SIMECK64/128 respectively, compare them with known attacks on 16 and 19 rounds SIMON48/96 and SIMON64/128 respectively. In addition, we use Algorithm 2 of Matsui to attack 18, 23 and 27 rounds of SIMECK32/64, SIMECK48/96 and SIMECK64/128 respectively, compare them with known attacks on 18, 19 and 21 rounds SIMON32/64, SIMON48/96 and SIMON64/128 respectively.

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Authors and Affiliations

  1. Department of Electrical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

    Nasour Bagheri

  2. School of Computer Science, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran

    Nasour Bagheri

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  1. Nasour Bagheri
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Correspondence to Nasour Bagheri .

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Editors and Affiliations

  1. Luxembourg, Luxembourg

    Alex Biryukov

  2. Microsoft Research India, Banglore, India

    Vipul Goyal

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Bagheri, N. (2015). Linear Cryptanalysis of Reduced-Round SIMECK Variants. In: Biryukov, A., Goyal, V. (eds) Progress in Cryptology -- INDOCRYPT 2015. INDOCRYPT 2015. Lecture Notes in Computer Science(), vol 9462. Springer, Cham. https://doi.org/10.1007/978-3-319-26617-6_8

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  • DOI: https://doi.org/10.1007/978-3-319-26617-6_8

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-26616-9

  • Online ISBN: 978-3-319-26617-6

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