Fast arithmetics in Artin-Schreier towers over finite fields

  • Authors:
  • Luca De Feo;Éric Schost

  • Affiliations:
  • LIX, École Polytechnique, Palaiseau, France and IRMAR, Université de Rennes 1, Rennes, France;ORCCA and CSD, The University of Western Ontario, London, ON, Canada

  • Venue:
  • Journal of Symbolic Computation
  • Year:
  • 2012

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Abstract

An Artin-Schreier tower over the finite field F"p is a tower of field extensions generated by polynomials of the form X^p-X-@a. Following Cantor and Couveignes, we give algorithms with quasi-linear time complexity for arithmetic operations in such towers. As an application, we present an implementation of Couveignes' algorithm for computing isogenies between elliptic curves using the p-torsion.