Evaluating logarithms in GF(2n)

  • Authors:
  • Don Coppersmith

  • Affiliations:
  • -

  • Venue:
  • STOC '84 Proceedings of the sixteenth annual ACM symposium on Theory of computing
  • Year:
  • 1984

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Abstract

We present a method for determining logarithms in GF(2n). Its asymptotic running time is O( exp (cn1/3log2/3n)) for a small constant c, while, by comparison, Adleman's scheme runs in time O( exp (c'n1/2log1/2n)). The ideas give a dramatic improvement even for moderate-sized fields such as GF(2127), and make (barely) possible computations in fields of size around 2400. The method is not applicable to GF(q) for a large prime q.