An Extension of Kedlaya's Point-Counting Algorithm to Superelliptic Curves

  • Authors:
  • Pierrick Gaudry;Nicolas Gürel

  • Affiliations:
  • -;-

  • Venue:
  • ASIACRYPT '01 Proceedings of the 7th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
  • Year:
  • 2001

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Abstract

We present an algorithm for counting points on superelliptic curves yr = f(x) over a finite field Fq of small characteristic different from r. This is an extension of an algorithm for hyperelliptic curves due to Kedlaya. In this extension, the complexity, assuming r and the genus are fixed, is O(log3+Ɛ q) in time and space, just like for hyperelliptic curves. We give some numerical examples obtained with our first implementation, thus provingthat cryptographic sizes are now reachable.