A randomized protocol for signing contracts
Communications of the ACM
Optimistic protocols for fair exchange
Proceedings of the 4th ACM conference on Computer and communications security
Optimal efficiency of optimistic contract signing
PODC '98 Proceedings of the seventeenth annual ACM symposium on Principles of distributed computing
Abuse-Free Multi-party Contract Signing
Proceedings of the 13th International Symposium on Distributed Computing
Round-Optimal and Abuse Free Optimistic Multi-party Contract Signing
ICALP '00 Proceedings of the 27th International Colloquium on Automata, Languages and Programming
Optimistic Asynchronous Multi-party Contract Signing with Reduced Number of Rounds
ICALP '01 Proceedings of the 28th International Colloquium on Automata, Languages and Programming,
An Optimistic Multi-party Fair Exchange Protocol with Reduced Trust Requirements
ICISC '01 Proceedings of the 4th International Conference Seoul on Information Security and Cryptology
Optimistic Fair Exchange with Transparent Signature Recovery
FC '01 Proceedings of the 5th International Conference on Financial Cryptography
Efficient Optimistic N-Party Contract Signing Protocol
ISC '01 Proceedings of the 4th International Conference on Information Security
Simple and fast optimistic protocols for fair electronic exchange
Proceedings of the twenty-second annual symposium on Principles of distributed computing
Optimistic fair exchange of digital signatures
IEEE Journal on Selected Areas in Communications
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Contract signing is a fundamental service in doing business. The Internet has facilitated the electronic commerce, and it is necessary to find appropriate mechanisms for contract signing in the digital world. From a designing point of view, digital contract signing is a particular form of electronic fair exchange. Protocols for generic exchange of digital signatures exist. There are also specific protocols for two-party contract signing. Nevertheless, in some applications, a contract may need to be signed by multiple parties. Less research has been done on multi-party contract signing. In this paper, we analyze an optimistic N-party contract signing protocol, and point out its security problem, thus demonstrating further work needs to be done on the design and analysis of secure and optimistic multi-party contract signing protocols.