2000 | OriginalPaper | Buchkapitel
Optimistic Fair Secure Computation
Extended Abstract
verfasst von : Christian Cachin, Jan Camenisch
Erschienen in: Advances in Cryptology — CRYPTO 2000
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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We present an efficient and fair protocol for secure two-party computation in the optimistic model, where a partially trusted third party T is available, but not involved in normal protocol executions. T is needed only if communication is disrupted or if one of the two parties misbehaves. The protocol guarantees that although one party may terminate the protocol at any time, the computation remains fair for the other party. Communication is over an asynchronous network. All our protocols are based on efficient proofs of knowledge and involve no general zero-knowledge tools. As intermediate steps we describe efficient verifiable oblivious transfer and verifiable secure function evaluation protocols, whose security is proved under the decisional Diffie-Hellman assumption.