无滥用的乐观多方合同签署协议  

Abuse-free and optimistic multi-party contract signing protocols

作　　者：李向东[1,2] 王清贤[1] 陈莉[1,3] 

机构地区：[1]解放军信息工程大学信息工程学院,郑州450002 [2]郑州大学西亚斯国际学院计算机科学系,河南新郑451150 [3]河南财经学院计算中心,郑州450002

出　　处：《计算机应用研究》2009年第5期1904-1907,共4页Application Research of Computers

基　　金：国家“863”计划资助项目(2007AA01Z471);河南省重点科技攻关项目(072102210029);河南省科技攻关项目(0624260017)

摘　　要：为了解决多方合同签署协议结构复杂、难以理解和分析、消息交换轮数和次数多、效率低等问题,提出了两个乐观多方合同签署协议,并分析了协议的公平性和无滥用性。协议1使用普通数字签名算法,满足公平性但不满足无滥用性;协议2使用一种专用合同签名算法,同时满足公平性和无滥用性。两个协议都具有简单的对称结构,不论有多少个不诚实用户,主协议只需两轮交换,消息交换次数为O(n2)。There were difficulties when analyzing and implementing multi-party contract signing protocols because of their complicated structure and inefficient message exchanges. This paper presented two optimistic multi-party contract signing protocols, and analyzed the properties of fairness and abuse-freeness. Protocol 1, based on ordinary digital signatures, was fair but not abuse-free. Protocol 2, based on private contract signatures, was both fair and abuse-free. Both protocols presented in this paper achieve a major improvement： the protocols are symmetric; the number of rounds is reduced to 2 no matter how many dishonest signatories there are.

关 键 词：无滥用性 多方合同签署 乐观协议 公平交换 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]