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 o...

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Main Authors: HUANG, Qiong, YANG, Guomin, WONG, Duncan S., SUSILO, Willy
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Language:English
Published: Institutional Knowledge at Singapore Management University 2008
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Online Access:https://ink.library.smu.edu.sg/sis_research/7381
https://ink.library.smu.edu.sg/context/sis_research/article/8384/viewcontent/Ambiguous_optimistic_fair_exchange.pdf
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spelling sg-smu-ink.sis_research-83842022-10-13T07:35:09Z Ambiguous optimistic fair exchange HUANG, Qiong YANG, Guomin WONG, Duncan S. SUSILO, Willy 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 construction with security proven without relying on the random oracle assumption. 2008-12-01T08:00:00Z text application/pdf https://ink.library.smu.edu.sg/sis_research/7381 info:doi/10.1007/978-3-540-89255-7_6 https://ink.library.smu.edu.sg/context/sis_research/article/8384/viewcontent/Ambiguous_optimistic_fair_exchange.pdf http://creativecommons.org/licenses/by-nc-nd/4.0/ Research Collection School Of Computing and Information Systems eng Institutional Knowledge at Singapore Management University Information Security
institution Singapore Management University
building SMU Libraries
continent Asia
country Singapore
Singapore
content_provider SMU Libraries
collection InK@SMU
language English
topic Information Security
spellingShingle Information Security
HUANG, Qiong
YANG, Guomin
WONG, Duncan S.
SUSILO, Willy
Ambiguous optimistic fair exchange
description 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 construction with security proven without relying on the random oracle assumption.
format text
author HUANG, Qiong
YANG, Guomin
WONG, Duncan S.
SUSILO, Willy
author_facet HUANG, Qiong
YANG, Guomin
WONG, Duncan S.
SUSILO, Willy
author_sort HUANG, Qiong
title Ambiguous optimistic fair exchange
title_short Ambiguous optimistic fair exchange
title_full Ambiguous optimistic fair exchange
title_fullStr Ambiguous optimistic fair exchange
title_full_unstemmed Ambiguous optimistic fair exchange
title_sort ambiguous optimistic fair exchange
publisher Institutional Knowledge at Singapore Management University
publishDate 2008
url https://ink.library.smu.edu.sg/sis_research/7381
https://ink.library.smu.edu.sg/context/sis_research/article/8384/viewcontent/Ambiguous_optimistic_fair_exchange.pdf
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