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IJACT
2008

An optimistic fair exchange protocol and its security in the universal composability framework

12 years 1 months ago
An optimistic fair exchange protocol and its security in the universal composability framework
: Fair exchange protocols allow both or neither of two parties to obtain the other's items, and this property is essential in e-commerce. In this paper, we construct an optimistic fair exchange protocol that is applicable to any digital signature by prescribing three forms of signatures, namely presignature, post-signature and notarised signature. We set an expiration date for presignature, and thus realise the timely termination of the protocol. Next, we define an ideal functionality of fair exchangeprotocolsintheuniversalcomposabilityframework. Then, weconstructanoptimisticfair exchangeprotocolbasedontheaboveprotocol, andproveitssecurityintheuniversalcomposability framework.
Yusuke Okada, Yoshifumi Manabe, Tatsuaki Okamoto
Added 12 Dec 2010
Updated 12 Dec 2010
Type Journal
Year 2008
Where IJACT
Authors Yusuke Okada, Yoshifumi Manabe, Tatsuaki Okamoto
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