摘要
Zhou-Gollmann协议是一种公平非否认协议,近年来得到广泛讨论。Kim发现该协议在时限公平性方面存在缺陷,针对该缺陷提出一种改进的协议,但其改进方法高度依赖于网络时钟的同步。通过详细分析,发现在缺乏时钟同步时Kim的改进协议也可导致不公平。针对此问题,提出一种新的改进方案。新的改进消除了协议对时钟同步的依赖性,保持了协议的公平非否认性,且不会降低协议的效率。
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 protocol, our new method avoids depending on synchronization of the clock, and keeps fairness and non-repudiation of the protocol.
出处
《计算机科学》
CSCD
北大核心
2009年第8期94-97,148,共5页
Computer Science
基金
江苏省自然科学基金(KB2008090)资助
关键词
公平性
非否认性
协议
时钟同步
Fairness, Non-repudiation, Protocol, Clock synchronization
