Prudent Engineering Practice for Cryptographic Protocols
IEEE Transactions on Software Engineering
Fair exchange with a semi-trusted third party (extended abstract)
Proceedings of the 4th ACM conference on Computer and communications security
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
Secure Group Barter: Multi-party Fair Exchange with Semi-Trusted Neutral Parties
FC '98 Proceedings of the Second International Conference on Financial Cryptography
Exclusion-Freeness in Multi-party Exchange Protocols
ISC '02 Proceedings of the 5th International Conference on Information Security
Multi-Party Fair Exchange with an Off-Line Trusted Neutral Party
DEXA '99 Proceedings of the 10th International Workshop on Database & Expert Systems Applications
An Efficient Non-repudiation Protocol
CSFW '97 Proceedings of the 10th IEEE workshop on Computer Security Foundations
A fair non-repudiation protocol
SP '96 Proceedings of the 1996 IEEE Symposium on Security and Privacy
FC'05 Proceedings of the 9th international conference on Financial Cryptography and Data Security
Optimistic fair exchange of digital signatures
IEEE Journal on Selected Areas in Communications
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Some electronic commerce transactions are inherently performed between more than two parties. In this context, it is thus important to determine whether the underlying fair exchange protocols allowing the secure implementation of such transactions enable participants to exclude other entities from a protocol execution. This is an important point that has not been sufficiently addressed when analysing such kind of protocols, and that may be crucial for the successful accomplishment of multi-party electronic transactions. In this paper we define the properties related to exchange protocols and exclusions, study exclusion scenarios on two well-known multi-party fair exchange protocols and point out the implications that exclusions may have on the trust relationships between participants, and, more generally, on electronic commerce. Two new protocols more robust than existing multi-party fair exchange protocols are therefore proposed.