Changing the Odds Against Masked Logic

  • Kris Tiri
  • Patrick Schaumont
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4356)

Abstract

Random switching logic (RSL) has been proposed as an efficient countermeasure to mitigate power analysis. The logic style equalizes the output transition probabilities using a random mask-bit. This manuscript, however, will show a successful attack against RSL. The single mask-bit can only add one bit of entropy to the information content of the overall power consumption variations and can very easily be deduced from the power consumption. Once the mask-bit is known, the a posteriori probabilities of the output transitions are not equal anymore and a power analysis can be mounted. A threshold filter suffices to remove the additional bit of information.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Kris Tiri
    • 1
  • Patrick Schaumont
    • 2
  1. 1.Trusted Platform Laboratory, Intel CorporationUSA
  2. 2.ECE Department, Virginia TechUSA

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