Efficient simultaneous broadcast

  • Authors:
  • Sebastian Faust;Emilia Käsper;Stefan Lucks

  • Affiliations:
  • K.U.Leuven, ESAT, COSIC, Leuven, Heverlee, Belgium;K.U.Leuven, ESAT, COSIC, Leuven, Heverlee, Belgium;Bauhaus-Universität Weimar, Weimar, Germany

  • Venue:
  • PKC'08 Proceedings of the Practice and theory in public key cryptography, 11th international conference on Public key cryptography
  • Year:
  • 2008

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Abstract

We present an efficient simultaneous broadcast protocol ν-SimCast that allows n players to announce independently chosen values, even if up to t n/2 players are corrupt. Independence is guaranteed in the partially synchronous communication model, where communication is structured into rounds, while each round is asynchronous. The ν-SimCast protocol is more efficient than previous constructions. For repeated executions, we reduce the communication and computation complexity by a factor O(n). Combined with a deterministic extractor, ν-SimCast provides a particularly efficient solution for distributed coin-flipping. The protocol does not require any zero-knowledge proofs and is shown to be secure in the standard model under the Decisional Diffie Hellman assumption.