Pseudo-random generators for all hardnesses

  • Authors:
  • Christopher Umans

  • Affiliations:
  • Computer Science Department, Caltech, Pasadena, CA

  • Venue:
  • Journal of Computer and System Sciences - STOC 2002
  • Year:
  • 2003

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Abstract

Given a function f:{0,1}log n → {0, 1} with circuit complexity s, we construct a pseudo-random generator that stretches a random seed of length O(logn) into a string of m = sΩ(1) pseudo-random bits that fool circuits of size m. The construction works for any hardness s, giving an optimal hardness vs. randomness tradeoff with a direct and self-contained proof. A key element in our construction is an augmentation of the standard low-degree extension encoding that exploits the field structure of the underlying space in a new way.