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。 Proposed a new fair trade agreement that allowed two parties, who did not trust each other, to exchange digital signatures fairly on the Internet. This Agreement is based on Offline Trusted Third Parties (TTPs) and TTP is not involved in the transaction unless either party fails to comply with the agreement or system fails. This agreement uses the designated validator’s signature for fair dealing, which greatly increases the efficiency of the agreement. Combining a given validator commitment with a normal Schnorr signature gives an efficient scheme for specifying validator signatures. Also analyzed the security of this agreement, to ensure the fairness of the agreement.