A family of trusted third party based fair-exchange protocols

Fair exchange protocols play an important role in application areas such as e-commerce where protocol participants require mutual guarantees that a transaction involving exchange of items has taken place in a specific manner. A protocol is fair if no protocol participant can gain any advantage over...

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Bibliographic Details
Published in:IEEE transactions on dependable and secure computing 2005-10, Vol.2 (4), p.273-286
Main Authors: Ezhilchelvan, P.D., Shrivastava, S.K.
Format: Article
Language:English
Subjects:
Communication
Communication system security
Computer crashes
Computer science
crash tolerance
Data security
Delay
Dishonesty
distributed systems
Electronic commerce
Fair exchange
Fault tolerance
Fault tolerant systems
Index Terms- Fair exchange
Mathematical models
Protocol
Protocols
security
smartcards
Studies
Third party
Trusted Third Party (TTP)
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Summary:Fair exchange protocols play an important role in application areas such as e-commerce where protocol participants require mutual guarantees that a transaction involving exchange of items has taken place in a specific manner. A protocol is fair if no protocol participant can gain any advantage over an honest participant by misbehaving. In addition, such a protocol is fault-tolerant if the protocol can ensure that an honest participant does not suffer any loss of fairness despite any failures of the participant's node. This paper presents a family of fair exchange protocols for two participants which make use of the presence of a trusted third party, under a variety of assumptions concerning participant misbehavior, message, delays, and node reliability. The development is systematic, beginning with the strongest set of the assumptions and gradually weakening the assumptions to the weakest set. The resulting protocol family exposes the impact of a given set of assumptions on solving the problem of fair exchange. Specifically, it highlights the relationships that exist between fairness and assumptions on the nature of participant misbehavior, communication delays, and node crashes. The paper also shows that the restrictions assumed on a dishonest participant's misbehavior can be realized through the use of smartcards and smartcard-based protocols.
ISSN:1545-5971
1941-0018
DOI:10.1109/TDSC.2005.40