一种双方不可否认密码协议

An undeniable cryptographic protocol for both thesender and the receiver

分析了已有的国内外各种不可否认协议,针对它们存在的共同缺点,提出一个更为完善的密码协议:可运行在不安全信道上实现交易的公平性与通信双方的不可否认性;避免了可信第三方与通信方共享密钥,且保证传递数据的机密性与收发方交易的隐私权;尽量减少可信第三方的工作量和负担,避免了其可能成为系统瓶颈的问题.协议是安全有效的.

We survey the state of non-repudiation cryptographic protocols, almost all of which have weaknesses. The paper proposes a perfect protocol which can be used to realize the strong fairness and non-repudiation of both parties even if the channels are not reliable. Usually the protocol only needs three interactions of participants and the transferring data remain confidential for others but the sender and the receiver, who are unknown to others. The Trusted Third Party(TTP) acts as a notary rather than a delivery and its bottleneck problem is solved completely. Finally the security of the protocol is analysed in detail.