一种新的采用指定的确认者签名的公平交易协议

A New Fair Exchange Protocol Using Designated Confirmer Signatures

提出一种新的公平交易协议，允许相互不信任的两个当事人在Ｉｎｔｅｒｎｅｔ上公平地交换数字签名。本协议基于离线的可信任的第三方（ＴＴＰ），除非某一方不遵守协议或者系统发生故障，ＴＴＰ不参与交易。本协议采用指定的确认者签名来实现公平交易，极大地提高了协议的效率。将指定的确认者承诺和普通的Ｓｃｈｎｏｒｒ签名相结合，提出一种高效的指定确认者签名方案。还分析了本协议的安全性，保证了协议的公平。

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.