Extractors for binary elliptic curves

  • Authors:
  • Reza Rezaeian Farashahi;Ruud Pellikaan;Andrey Sidorenko

  • Affiliations:
  • Department of Mathematics and Computer Science, TU Eindhoven, Eindhoven, The Nertherlands 5600 MB and Department of Mathematical Sciences, Isfahan University of technology, Isfahan, Iran;Department of Mathematics and Computer Science, TU Eindhoven, Eindhoven, The Netherlands 5600 MB;Brightsight BV, Delft, The Netherlands 2628 XJ

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 2008

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Abstract

We propose a simple and efficient deterministic extractor for an ordinary elliptic curve E, defined over $$\mathbb{F}_{2^n}$$ , where n = 2驴 and 驴 is a positive integer. Our extractor, for a given point P on E, outputs the first $${\mathbb{F}}_{2^\ell}$$ -coefficient of the abscissa of the point P. We also propose a deterministic extractor for the main subgroup G of E, where E has minimal 2-torsion. We show that if a point P is chosen uniformly at random in G, the bits extracted from the point P are indistinguishable from a uniformly random bit-string of length 驴.