Efficient multiplication in F3lm, m ≥ 1 and 5 ≤ l ≤ 18

  • Authors:
  • Murat Cenk;Ferruh Özbudak

  • Affiliations:
  • Department of Mathematics and Computer Science, Çankaya University, Ankara, Turkey;Department of Mathematics and Institute of Applied Mathematics, Middle East Technical University, Ankara, Turkey

  • Venue:
  • AFRICACRYPT'08 Proceedings of the Cryptology in Africa 1st international conference on Progress in cryptology
  • Year:
  • 2008

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Abstract

Using a method based on Chinese Remainder Theorem for polynomial multiplication and suitable reductions, we obtain an efficient multiplication method for finite fields of characteristic 3. Large finite fields of characteristic 3 are important for pairing based cryptography [3]. For 5 ≤ l ≤ 18, we show that our method gives canonical multiplication formulae over F3lm for any m ≤ 1 with the best multiplicative complexity improving the bounds in [6]. We give explicit formula in the case F36.97.