Completely fair SFE and coalition-safe cheap talk

  • Authors:
  • Matt Lepinski;Silvio Micali;Chris Peikert;Abhi Shelat

  • Affiliations:
  • MIT CSAIL, Cambridge, MA;MIT CSAIL, Cambridge, MA;MIT CSAIL, Cambridge, MA;MIT CSAIL, Cambridge, MA

  • Venue:
  • Proceedings of the twenty-third annual ACM symposium on Principles of distributed computing
  • Year:
  • 2004

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Abstract

Secure function evaluation (SFE) enables a group of players, by themselves, to evaluate a function on private inputs as securely as if a trusted third party had done it for them. A completely fair SFE is a protocol in which, conceptually, the function values are learned atomically.We provide a completely fair SFE protocol which is secure for any number of malicious players, using a novel combination of computational and physical channel assumptions.We also show how completely fair SFE has striking applications togame theory. In particular, it enables "cheap-talk" protocol that(a) achieve correlated-equilibrium payoffs in any game, (b) are the first protocols which provably give no additional power to any coalition of players, and (c) are exponentially more efficient than prior counterparts.