New Improvement on a Fair Non-repudiation Protocol
对一种公平非否认协议的新改进

Zhou-Gollmann protocol is a fair non-repudiation protocol which is widely discussed in recent years.Kim found a flaw of this protocol on time-limited fairness.Aimming at this flaw,Kim gave an improved protocol,but the improved schema highly depended on synchronization of network clock.We analyzed Kim's protocol in detail and show that,without clock synchronization,Kim's improved protocol is also unfair.Then we proposed a new schema to improve it further.Without reducing the efficiency of the original protoc...