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针对目前三方合同签署协议中安全性与效率性的问题,利用可验证加密的变色龙签名(verifiable encryptionof chameleon signatures,VECS)技术,设计了一个高效的无滥用的三方合同签署协议。理论分析结果表明,该协议同时满足完整性、公平性、无滥用性、可追究性、第三方(TTP)的不可见性和TTP合同保密性。而且与以前的三方合同签署协议相比,所设计的协议减少了合同签署方之间交互的轮数及发送消息的数量,因此效率更高。
Aiming at the problem of security and efficiency in the current three-party contract signing agreement, an efficient and abuse-free three-party contract signing protocol is designed by verifiable encryption of chameleon signatures (VECS). Theoretical analysis shows that the protocol satisfies the integrity, fairness, abusiveness, accountability, third party (TTP) invisibility and TTP contract confidentiality. And, compared to previous tripartite contracts, agreements are designed to be more efficient, reducing the number of rounds of interaction and contracting parties sending messages.