Ambiguous optimistic fair exchange: Definition and constructions

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 2015
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Online Access:https://ink.library.smu.edu.sg/sis_research/7340
https://ink.library.smu.edu.sg/context/sis_research/article/8343/viewcontent/1_s2.0_S0304397514007336_main.pdf
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spelling sg-smu-ink.sis_research-83432022-10-06T02:23:41Z Ambiguous optimistic fair exchange: Definition and constructions 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 (AOFE), which is a variant of OFE and requires additionally that the verifier cannot convince anybody about the authorship of a partial signature generated by the signer. We present a formal security model for AOFE in the multi-user setting and chosen-key model, and propose a generic construction of AOFE that is provably secure under our model. Furthermore, we propose an efficient instantiation of the generic construction, security of which is based on Strong Diffie–Hellman assumption and Decision Linear assumption without random oracles. 2015-01-01T08:00:00Z text application/pdf https://ink.library.smu.edu.sg/sis_research/7340 info:doi/10.1016/j.tcs.2014.09.043 https://ink.library.smu.edu.sg/context/sis_research/article/8343/viewcontent/1_s2.0_S0304397514007336_main.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 Ambiguity NIZK proof Optimistic fair exchange Signature Standard model Information Security
institution Singapore Management University
building SMU Libraries
continent Asia
country Singapore
Singapore
content_provider SMU Libraries
collection InK@SMU
language English
topic Ambiguity
NIZK proof
Optimistic fair exchange
Signature
Standard model
Information Security
spellingShingle Ambiguity
NIZK proof
Optimistic fair exchange
Signature
Standard model
Information Security
HUANG, Qiong
YANG, Guomin
WONG, Duncan S.
SUSILO, Willy
Ambiguous optimistic fair exchange: Definition and constructions
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 (AOFE), which is a variant of OFE and requires additionally that the verifier cannot convince anybody about the authorship of a partial signature generated by the signer. We present a formal security model for AOFE in the multi-user setting and chosen-key model, and propose a generic construction of AOFE that is provably secure under our model. Furthermore, we propose an efficient instantiation of the generic construction, security of which is based on Strong Diffie–Hellman assumption and Decision Linear assumption without random oracles.
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: Definition and constructions
title_short Ambiguous optimistic fair exchange: Definition and constructions
title_full Ambiguous optimistic fair exchange: Definition and constructions
title_fullStr Ambiguous optimistic fair exchange: Definition and constructions
title_full_unstemmed Ambiguous optimistic fair exchange: Definition and constructions
title_sort ambiguous optimistic fair exchange: definition and constructions
publisher Institutional Knowledge at Singapore Management University
publishDate 2015
url https://ink.library.smu.edu.sg/sis_research/7340
https://ink.library.smu.edu.sg/context/sis_research/article/8343/viewcontent/1_s2.0_S0304397514007336_main.pdf
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