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Certificate-based Fair Exchange Protocol of Schnorr Signatures in Chosen-key Model

Shao Z., Gao Y.

Fundamenta Informaticae

2015

Vol. 141, nr 1

95--114

This paper proposes the first optimistic protocol to accomplish the fair exchange of standard Schnorr signatures in the chosen-key model, in which each participant is allowed to choose his Schnorr key pair freely without showing his knowledge of the private key. Besides solving the authentication problem of public keys, the protocol relaxes excessive trust on the adjudicator since the adjudicator needs to be trusted only by the signer. The protocol is secure against three types of inside adversaries under the DL assumption in the random oracle model. It suits much more the actual circumstances of the Internet.