A Fast Algorithm for Multiplicative Inversion in GF(2m) Using Normal Basis

  • Authors:
  • Naofumi Takagi;Jun-ichi Yoshiki;Kazuyoshi Takagi

  • Affiliations:
  • Nagoya Univ., Nagoya, Japan;Oki Electric Industry Co., Ltd., Minato-ku, Tokyo, Japan;Nagoya Univ., Nagoya, Japan

  • Venue:
  • IEEE Transactions on Computers
  • Year:
  • 2001

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Abstract

A fast algorithm for multiplicative inversion in $GF(2^m)$ using normal basis is proposed. It is an improvement on those proposed by Itoh and Tsujii and by Chang et al., which are based on Fermat's Theorem and require $O(\log m)$ multiplications. The number of multiplications is reduced by decomposing $m-1$ into several factors and a small remainder.