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A More Compact AES

  • David Canright
  • Dag Arne Osvik
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5867)

Abstract

We explore ways to reduce the number of bit operations required to implement AES. One way involves optimizing the composite field approach for entire rounds of AES. Another way is integrating the Galois multiplications of MixColumns with the linear transformations of the S-box. Combined with careful optimizations, these reduce the number of bit operations to encrypt one block by 9.0%, compared to earlier work that used the composite field only in the S-box. For decryption, the improvement is 13.5%. This work may be useful both as a starting point for a bit-sliced software implementation, where reducing operations increases speed, and also for hardware with limited resources.

Keywords

AES tower field composite Galois field bitslice 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • David Canright
    • 1
  • Dag Arne Osvik
    • 2
  1. 1.Naval Postgraduate SchoolMontereyUSA
  2. 2.École Polytechnique Fédérale de Lausanne 

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