Application of security technology in communications system——A new non repudiation protocol

Based on the non repudiation and the security protocol of non repudiation for electronic commerce, this paper introduces a new non repudiation protocol. The protocol has traceableness and is e-fair. Time chain is added as time tag. The non repudiation service is implemented by the time chain's corresponding to the event one. The running rate is guaranteed by using digital signature and symmetry encryption in the case of employing the ID event number. The protocol may be used to solve all kinds of non repudiation and the problem of time. It is a gradual exchange. With its mutuality, it can be used in chatting, negotiating and so on.