Efficient Subgroup Exponentiation in Quadratic and Sixth Degree Extensions

  • Authors:
  • Martijn Stam;Arjen K. Lenstra

  • Affiliations:
  • -;-

  • Venue:
  • CHES '02 Revised Papers from the 4th International Workshop on Cryptographic Hardware and Embedded Systems
  • Year:
  • 2002

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Abstract

This paper describes several speedups for computation in the order p + 1 subgroup of F*p2 and the order p2 - p + 1 subgroup of F*p6. These results are in a way complementary to LUC and XTR, where computations in these groups are sped up using trace maps. As a side result, we present an efficient method for XTR with p = 3 mod 4.