A New Fair Exchange Protocol Using Designated Confirmer Signatures
LU Song-nian · Jisuanji gongcheng · 2000
we propose a new efficient protocol. which allows a pair of potentially mistrusting parties to exchange digital signatures over the Internet in a fair way. The protocol relies on an off-line Trusted Third Party (TTP). which does not take part in the exchange unless any of the parties behaves improperly or other faults occur. Efficiency of the protocol is achieved by using a cryptographic primitive, called designated confirmer signatures. The confirmer commitment schemes and ordinary signatures are combines to form the confirmer signatures. The security of the protocol is analyzed and the fairness of it is guaranteed.