Public Key Infrastructures, Services and Applications

Volume 6711 of the series Lecture Notes in Computer Science pp 125-140

A Fair and Abuse-Free Contract Signing Protocol from Boneh-Boyen Signature

  • Somayeh HeidarvandAffiliated withUniversitat Politècnica de Catalunya
  • , Jorge L. VillarAffiliated withUniversitat Politècnica de Catalunya

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A fair contract signing protocol is used to enable two mistrusted parties to exchange two signatures on a given contract, in such a way that either both of them get the other party’s signature, or none of them gets anything. A new signature scheme is presented, which is a variant of Boneh and Boyen’s scheme, and building on it, we propose a new signature fair exchange protocol for which all the properties of being optimistic, setup-free and abuse-free can be proved without random oracles, and it is more efficient than the known schemes with comparable properties.


optimistic fair exchange Boneh-Boyen signature abuse-freeness standard model