Deterministic Extractors for Bit-Fixing Sources and Exposure-Resilient Cryptography

  • Authors:
  • Jesse Kamp;David Zuckerman

  • Affiliations:
  • -;-

  • Venue:
  • FOCS '03 Proceedings of the 44th Annual IEEE Symposium on Foundations of Computer Science
  • Year:
  • 2003

Quantified Score

Hi-index 0.00

Visualization

Abstract

We give an efficient deterministic algorithm which extracts \Omega (n^{2\gamma } ) almost-random bits from sources where n^{\frac{1}{2} + \gamma } of the n bits are uniformly random and the rest are fixed in advance. This improves on previous constructions which required that at least n/2 of the bits be random. Our construction also gives explicit adaptive exposure-resilient functions and in turn adaptive all-or-nothing transforms. For sources where instead of bits the values are chosen from [d], for d 2, we give an algorithm which extracts a constant fraction of the randomness. We also give bounds on extracting randomness for sources where the fixed bits can depend on the random bits..