The complexity of perfect zero-knowledge

  title={The complexity of perfect zero-knowledge},
  author={Lance Fortnow},
  journal={Advances in Computing Research},
  • Lance Fortnow
  • Published 1987 in Structure in Complexity Theory Conference
A Perfect Zero-Knowledge interactive proof system convinces a veriier that a string is in a language without revealing any additional knowledge in an information-theoretic sense. We show that for any language that has a perfect zero-knowledge proof system, its complement has a short interactive protocol. This result implies that there are not any perfect zero-knowledge protocols for NP-complete languages unless the polynomial time hierarchy collapses. This paper demonstrates that knowledge… CONTINUE READING
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