Handling Expected Polynomial-Time Strategies in Simulation-Based Security Proofs

  title={Handling Expected Polynomial-Time Strategies in Simulation-Based Security Proofs},
  author={Jonathan Katz and Yehuda Lindell},
  journal={Journal of Cryptology},
The standard class of adversaries considered in cryptography is that of strict polynomial-time probabilistic machines. However, expected polynomial-time machines are often also considered. For example, there are many zero-knowledge protocols for which the only known simulation techniques run in expected (and not strict) polynomial time. In addition, it has been shown that expected polynomial-time simulation is essential for achieving constant-round black-box zero-knowledge protocols. This… CONTINUE READING
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