Analysis of the Xedni Calculus Attack

  • Authors:
  • Michael J. Jacobson;Neal Koblitz;Joseph H. Silverman;Andreas Stein;Edlyn Teske

  • Affiliations:
  • -;-;-;-;Centre for Applied Cryptographic Research, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2000

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Abstract

Thexedni calculus attack on the elliptic curve discrete logarithmproblem (ECDLP) involves lifting points from the finite field{\Bbb F}_p to the rational numbers {\Bbb Q}and then constructing an elliptic curve over {\Bbb Q}that passes through them. If the lifted points are linearly dependent,then the ECDLP is solved. Our purpose is to analyze the practicalityof this algorithm. We find that asymptotically the algorithmis virtually certain to fail, because of an absolute bound onthe size of the coefficients of a relation satisfied by the liftedpoints. Moreover, even for smaller values of p experimentsshow that the odds against finding a suitable lifting are prohibitivelyhigh.