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Formal analysis and design of multi-party fair exchange protocols

Science in china(Series F) 2006年第2期49卷 155-174页

作者： qing sihan1,{1.,{2., institute of software, chinese academy of sciences, Beijing 1.0080, china 2. Beijing Zhongke Ansheng Corporation of information technology, Beijing 1.0080, china 3. Graduate School of the chinese academy of sciences, Beijing 1.0039, china engineering {1. {2. for information security technology Institute of Software Chinese Academy of Sciences Beijing Zhongke Ansheng Corporation of information {1. Graduate School of the chinese academy of sciences

Based on the origin of message items and channel combination between transacting parties, and events and relations among events, this paper presents a concise, precise, and hierarchical model for general fair exchange protocols, formally specifies various security requirements which are able to reflect inherent requirements for fair exchange protocols more rigorously, and partition these security requirements with fine granularity. This work helps analyze, debug, and design multi-party fair exchange protocols more effectively and elaborately,

关键词： fair exchange logical protocol formal model security requirement.

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A formal model of fair exchange protocols

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Science in china(Series F) 2005年第4期48卷 499-512页

作者： qing sihan1,2.3 & li gaicheng1,2.{2., institute of software, chinese Aca- demy of sciences, Beijing 100080, china 2. Beijing Zhongke Ansheng Corporation of information technology, Beijing 100080, china 3. Graduate School of the chinese academy of sciences, Beijing 100039, china engineering {1. {2. for information security technology Institute of Software Chinese Aca- demy of Sciences Beijing Zhongke Ansheng Corporation of information {1. Graduate School of the chinese academy of sciences

Based on the study of existing fair exchange protocols, this paper sets up an accurate formal model by stepwise refinement. In the process of refinement an unreliable channel is employed to simulate an attack behavior. The model provides a novel formal definition of exchanged items, and presents the formal goals for fairness, accountability, etc., reflecting the inherent requirements for fair exchange protocols across-the-board. In order to check, prove, and design fair exchange protocols effectively and efficiently, the model puts forward a novel property of abuse-freeness which applies to all fair exchange protocols, gives a formal definition for trust strand of the third party, and presents general criteria of designing a secure and effective fair exchange protocol. Taking a typical fair exchange protocol as an example, this paper presents the analysis steps of fair exchange protocols appealing to our model. An unknown attack is uncovered. The analysis reveals the process of a complete attack, discovering deeper reasons for causing an attack. Finally, we modify the flawed protocol and the revised protocol ensures the desirable properties.

关键词： events local causal relation local temporal relation global relation exchanged item security goals.

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