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A family of trusted third party based fair-exchange protocols

Lookup NU author(s): Dr Paul EzhilchelvanORCiD, Emeritus Professor Santosh Shrivastava



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. © 2005 IEEE.

Publication metadata

Author(s): Ezhilchelvan PD, Shrivastava SK

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Dependable and Secure Computing

Year: 2005

Volume: 2

Issue: 4

Pages: 273-286

Print publication date: 01/10/2005

ISSN (print): 1545-5971

ISSN (electronic): 1941-0018

Publisher: IEEE


DOI: 10.1109/TDSC.2005.40


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