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Erschienen in:
2009 | OriginalPaper | Buchkapitel
Optimistic Fair Exchange Using Trusted Devices
verfasst von : Mohammad Torabi Dashti
Erschienen in: Stabilization, Safety, and Security of Distributed Systems
Verlag: Springer Berlin Heidelberg
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Efficiency of optimistic fair exchange using trusted devices is studied. Pfitzmann, Schunter and Waidner (
podc
1998) have shown that four messages in the main sub-protocol is optimal when exchanging idempotent items using non-trusted devices. It is straightforward that when using trusted devices for exchanging non-idempotent items this number can be reduced to three. This however comes at the cost of providing trusted devices with an unlimited amount of storage. We prove that exchanging non-idempotent items using trusted devices with a limited storage capacity requires exactly four messages in the main sub-protocol.