Finite Field Multiplication Combining AMNS and DFT Approach for Pairing Cryptography

  • Authors:
  • Nadia Mrabet;Christophe Negre

  • Affiliations:
  • LIRMM Laboratory, I3M, CNRS, University Montpellier 2, France;DALI/ELIAUS, University of Perpignan, France

  • Venue:
  • ACISP '09 Proceedings of the 14th Australasian Conference on Information Security and Privacy
  • Year:
  • 2009

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Abstract

Pairings over elliptic curves use fields $\mathbb{F}_{p^k}$ with p *** 2160 and 6 k ≤ 32. In this paper we propose to represent elements in $\mathbb{F}_p$ with AMNS sytem of [1]. For well chosen AMNS we get roots of unity with sparse representation. The multiplication by these roots are thus really efficient in $\mathbb{F}_p$. The DFT/FFT approach for multiplication in extension field $F_{p^k}$ is thus optimized. The resulting complexity of a multiplication in $\mathbb{F}_{p^k}$ combining AMNS and DFT is about 50% less than the previously recommended approach [2].