Open Access
2014 Formal Analysis of Fairness for Optimistic Multiparty Contract Signing Protocol
Xiaoru Li, Xiaohong Li, Guangquan Xu, Jing Hu, Zhiyong Feng
J. Appl. Math. 2014(SI11): 1-10 (2014). DOI: 10.1155/2014/983204


Optimistic multiparty contract signing (OMPCS) protocols are proposed for exchanging multiparty digital signatures in a contract. Compared with general two-party exchanging protocols, such protocols are more complicated, because the number of protocol messages and states increases considerably when signatories increase. Moreover, fairness property in such protocols requires protection from each signatory rather than from an external hostile agent. It thus presents a challenge for formal verification. In our analysis, we employ and combine the strength of extended modeling language CSP# and linear temporal logic (LTL) to verify the fairness of OMPCS protocols. Furthermore, for solving or mitigating the state space explosion problem, we set a state reduction algorithm which can decrease the redundant states properly and reduce the time and space complexity greatly. Finally, this paper illustrates the feasibility of our approach by analyzing the GM and CKS protocols, and several fairness flaws have been found in certain computation times.


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Xiaoru Li. Xiaohong Li. Guangquan Xu. Jing Hu. Zhiyong Feng. "Formal Analysis of Fairness for Optimistic Multiparty Contract Signing Protocol." J. Appl. Math. 2014 (SI11) 1 - 10, 2014.


Published: 2014
First available in Project Euclid: 1 October 2014

zbMATH: 07132035
Digital Object Identifier: 10.1155/2014/983204

Rights: Copyright © 2014 Hindawi

Vol.2014 • No. SI11 • 2014
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