Public key identification based on the equivalence of quadratic forms

  • Authors:
  • Rupert J. Hartung;Claus-Peter Schnorr

  • Affiliations:
  • Johann Wolfgang Goethe Universität Frankfurt a. M., Frankfurt a. M., Germany;Johann Wolfgang Goethe Universität Frankfurt a. M., Frankfurt a. M., Germany

  • Venue:
  • MFCS'07 Proceedings of the 32nd international conference on Mathematical Foundations of Computer Science
  • Year:
  • 2007

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Abstract

The computational equivalence problem for quadratic forms is shown to be NP-hard under randomized reductions, in particular for indefinite, ternary quadratic forms with integer coefficients. This result is conditional on a variant of the Cohen-Lenstra heuristics on class numbers. Our identification scheme proves knowledge of an equivalence transform.