International Cryptology Conference

CRYPTO 2014: Advances in Cryptology – CRYPTO 2014 pp 57-76 | Cite as

Block Ciphers – Focus on the Linear Layer (feat. PRIDE)

  • Martin R. Albrecht
  • Benedikt Driessen
  • Elif Bilge Kavun
  • Gregor Leander
  • Christof Paar
  • Tolga Yalçın
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8616)

Abstract

The linear layer is a core component in any substitution-permutation network block cipher. Its design significantly influences both the security and the efficiency of the resulting block cipher. Surprisingly, not many general constructions are known that allow to choose trade-offs between security and efficiency. Especially, when compared to Sboxes, it seems that the linear layer is crucially understudied. In this paper, we propose a general methodology to construct good, sometimes optimal, linear layers allowing for a large variety of trade-offs. We give several instances of our construction and on top underline its value by presenting a new block cipher. PRIDE is optimized for 8-bit micro-controllers and significantly outperforms all academic solutions both in terms of code size and cycle count.

Keywords

block cipher linear layer wide-trail embedded processors 

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Copyright information

© International Association for Cryptologic Research 2014

Authors and Affiliations

  • Martin R. Albrecht
    • 1
  • Benedikt Driessen
    • 2
  • Elif Bilge Kavun
    • 3
  • Gregor Leander
    • 3
  • Christof Paar
    • 3
  • Tolga Yalçın
    • 4
  1. 1.Information Security GroupRoyal Holloway, University of LondonUK
  2. 2.Infineon AG, NeubibergGermany
  3. 3.Horst Görtz Institute for IT SecurityRuhr-Universität BochumGermany
  4. 4.University of Information Science and TechnologyOhridMacedonia

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