一种基于签密方案的公平不可否认协议

he non-repudiation and fairness of sender and receiver are very important in secure data transport protocol. It has been usually implemented by non-reputation protocol used during data transmission. Using data signature technology insures the non-repudiation and data integrality. In these years, this type cipher protocol is actualized by data encrypt and sending which a trusted third part participates in. Therefore, reliability and security of the trusted third party are bottleneck of system performance. In this paper, a new fair non-repudiation protocol is presented based on the correction of CMP1 protocol which has some flaws. The new protocol can achieve non-reputation、fairness and anti-replay attack and can also insure that messages can be known by correspondence principals, which can widely be applied in E-mail、E-contract etc.