Nearly one-sided tests and the Goldreich-Levin predicate

  • Authors:
  • Gustav Hast

  • Affiliations:
  • Department of Numerical Analysis and Computer Science, Royal Institute of Technology, Stockholm, Sweden

  • Venue:
  • EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
  • Year:
  • 2003

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Abstract

We study statistical tests with binary output that rarely outputs one, which we call nearly one-sided statistical tests. We provide an efficient reduction establishing improved security for the Goldreich-Levin hard-core bit against nearly one-sided tests. The analysis is extended to prove the security of the Blum-Micali pseudo-random generator combined with the Goldreich-Levin bit. Furthermore, applications where nearly one-sided tests naturally occur are discussed. This includes cryptographic constructions that replace real randomness with pseudo-randomness and where the adversary's success easily can be verified. In particular, this applies to signature schemes that utilize a pseudo-random generator as a provider of randomness.