Trading Inversions for Multiplications in Elliptic Curve Cryptography

  • Authors:
  • Mathieu Ciet;Marc Joye;Kristin Lauter;Peter L. Montgomery

  • Affiliations:
  • Gemplus S.A., Card Security Group, La Ciotat Cedex, France 13705;CIM-PACA, Centre de Micro-électronique de Provence --- George Charpak, Gardanne, France 13120;Microsoft Research, One Microsoft Way, Redmond, USA 98052;Microsoft Research, One Microsoft Way, Redmond, USA 98052

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2006

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Abstract

Recently, Eisenträger et al. proposed a very elegant method for speeding up scalar multiplication on elliptic curves. Their method relies on improved formulas for evaluating S=(2P + Q) from given points P and Q on an elliptic curve. Compared to the naive approach, the improved formulas save a field multiplication each time the operation is performed. This paper proposes a variant which is faster whenever a field inversion is more expensive than six field multiplications. We also give an improvement when tripling a point, and present a ternary/binary method to perform efficient scalar multiplication.