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ASIACRYPT
2008
Springer

Ambiguous Optimistic Fair Exchange

13 years 5 months ago
Ambiguous Optimistic Fair Exchange
Optimistic fair exchange (OFE) is a protocol for solving the problem of exchanging items or services in a fair manner between two parties, a signer and a verifier, with the help of an arbitrator which is called in only when a dispute happens between the two parties. In almost all the previous work on OFE, after obtaining a partial signature from the signer, the verifier can present it to others and show that the signer has indeed committed itself to something corresponding to the partial signature even prior to the completion of the transaction. In some scenarios, this capability given to the verifier may be harmful to the signer. In this paper, we propose the notion of ambiguous optimistic fair exchange (A-OFE), which is an OFE but also requires that the verifier cannot convince anybody about the authorship of a partial signature generated by the signer. We present a formal security model for A-OFE in the multi-user setting and chosen-key model. We also propose an efficient construct...
Qiong Huang, Guomin Yang, Duncan S. Wong, Willy Su
Added 12 Oct 2010
Updated 12 Oct 2010
Type Conference
Year 2008
Where ASIACRYPT
Authors Qiong Huang, Guomin Yang, Duncan S. Wong, Willy Susilo
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