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Weak Keys of Reduced-Round PRESENT for Linear Cryptanalysis

  • Kenji Ohkuma
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5867)

Abstract

The block cipher PRESENT designed as an ultra-light weight cipher has a 31-round SPN structure in which the S-box layer has 16-parallel 4-bit S-boxes and the diffusion layer is a bit permutation. The designers claimed that the maximum linear characteristic deviation is not more than 2− 43 for 28 rounds and concluded that PRESENT is not vulnerable to linear cryptanalysis. But we have found that 32% of PRESENT keys are weak for linear cryptanalysis, and the linear deviation can be much larger than the linear characteristic value by the multi-path effect. And we discovered a 28-round path with a linear deviation of 2− 39.3 for the weak keys. Furthermore, we found that linear cryptanalysis can be used to attack up to 24 rounds of PRESENT for the weak keys.

Keywords

Linear Cryptanalysis Binary Distribution Preceding Round Round Attack Integral Attack 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Kenji Ohkuma
    • 1
    • 2
  1. 1.Corporate R & D CenterToshiba Corporation 
  2. 2.IT Security CenterInformation-technology Promotion AgencyJapan

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