A randomized protocol for signing contracts
Communications of the ACM
Practical and provably secure release of a secret and exchange of signatures
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
Fair exchange with a semi-trusted third party (extended abstract)
Proceedings of the 4th ACM conference on Computer and communications security
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
A method for obtaining digital signatures and public-key cryptosystems
Communications of the ACM
Round-Optimal and Abuse Free Optimistic Multi-party Contract Signing
ICALP '00 Proceedings of the 27th International Colloquium on Automata, Languages and Programming
Abuse-Free Optimistic Contract Signing
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
An Efficient Protocol for Certified Electronic Mail
ISW '00 Proceedings of the Third International Workshop on Information Security
Some Remarks on a Fair Exchange Protocol
PKC '00 Proceedings of the Third International Workshop on Practice and Theory in Public Key Cryptography: Public Key Cryptography
An Efficient Non-repudiation Protocol
CSFW '97 Proceedings of the 10th IEEE workshop on Computer Security Foundations
A Juridical Validation of a Contract Signing Protocol
EC-WEB '02 Proceedings of the Third International Conference on E-Commerce and Web Technologies
A Realistic Protocol for Multi-party Certified Electronic Mail
ISC '02 Proceedings of the 5th International Conference on Information Security
Multiparty nonrepudiation: A survey
ACM Computing Surveys (CSUR)
Fair electronic exchange using biometrics
Proceedings of the 5th Annual Workshop on Cyber Security and Information Intelligence Research: Cyber Security and Information Intelligence Challenges and Strategies
An agent-mediated fair exchange protocol
ICICS'10 Proceedings of the 12th international conference on Information and communications security
Attacking an asynchronous multi-party contract signing protocol
INDOCRYPT'05 Proceedings of the 6th international conference on Cryptology in India
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Contract signing is a fundamental service in the environment of the electronic commerce. It is a kind of fair exchange of values: a signature on a text contract for another signature on the same text. We present a fair protocol that requires the existence and possible involvement of a TTP (trusted third party), but it only intervenes in case of exception (it plays a subsidiary role). The protocol is the best solution to the date in terms of efficiency. We present and analyse a two-party and three-party version of the protocol, and we outline an N-party version. Finally, it is very simple and easy to understand. If we think that at the end some conflicts will be solved in courts, it is a non worthless characteristic.