Privacy-preserving FairSwap: Fairness and privacy interplay

Fair exchange protocols are among the most important cryptographic primitives in electronic commerce. A basic fair exchange protocol requires that two parties who want to exchange their digital items either receive what they have been promised, or lose nothing. Privacy of fair exchange requires that...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Avizheh Sepideh, Haffey Preston, Safavi-Naini Reihaneh
Formato:	article
Lenguaje:	EN
Publicado:	Sciendo 2022
Materias:	fair exchange smart contract privacy probing attack Ethics BJ1-1725 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/d27e3eaee91a407a8ac7ed75c532f18a
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:d27e3eaee91a407a8ac7ed75c532f18a
record_format	dspace
spelling	oai:doaj.org-article:d27e3eaee91a407a8ac7ed75c532f18a2021-12-05T14:11:10ZPrivacy-preserving FairSwap: Fairness and privacy interplay2299-098410.2478/popets-2022-0021https://doaj.org/article/d27e3eaee91a407a8ac7ed75c532f18a2022-01-01T00:00:00Zhttps://doi.org/10.2478/popets-2022-0021https://doaj.org/toc/2299-0984Fair exchange protocols are among the most important cryptographic primitives in electronic commerce. A basic fair exchange protocol requires that two parties who want to exchange their digital items either receive what they have been promised, or lose nothing. Privacy of fair exchange requires that no one else (other than the two parties) learns anything about the items. Fairness and privacy have been considered as two distinct properties of an exchange protocol. In this paper, we show that subtle ways of leaking the exchange item to the third parties affect fairness in fair exchange protocols when the item is confidential. Our focus is on Fair-Swap, a recently proposed fair exchange protocol that uses a smart contract for dispute resolution, has proven security in UC (Universal Composability) framework, and provides privacy when both parties are honest. We demonstrate, however, that FairSwap’s dispute resolution protocol leaks information to the public and this leakage provides opportunities for the dishonest parties to influence the protocol’s fairness guarantee. We then propose an efficient privacy-enhanced version of Fair-Swap, prove its security and give an implementation and performance evaluation of our proposed system. Our privacy enhancement uses circuit randomization, and we prove its security and privacy in an extension of universal composability model for non-monolithic adversaries that would be of independent interest.Avizheh SepidehHaffey PrestonSafavi-Naini ReihanehSciendoarticlefair exchangesmart contractprivacyprobing attackEthicsBJ1-1725Electronic computers. Computer scienceQA75.5-76.95ENProceedings on Privacy Enhancing Technologies, Vol 2022, Iss 1, Pp 417-439 (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	fair exchange smart contract privacy probing attack Ethics BJ1-1725 Electronic computers. Computer science QA75.5-76.95
spellingShingle	fair exchange smart contract privacy probing attack Ethics BJ1-1725 Electronic computers. Computer science QA75.5-76.95 Avizheh Sepideh Haffey Preston Safavi-Naini Reihaneh Privacy-preserving FairSwap: Fairness and privacy interplay
description	Fair exchange protocols are among the most important cryptographic primitives in electronic commerce. A basic fair exchange protocol requires that two parties who want to exchange their digital items either receive what they have been promised, or lose nothing. Privacy of fair exchange requires that no one else (other than the two parties) learns anything about the items. Fairness and privacy have been considered as two distinct properties of an exchange protocol. In this paper, we show that subtle ways of leaking the exchange item to the third parties affect fairness in fair exchange protocols when the item is confidential. Our focus is on Fair-Swap, a recently proposed fair exchange protocol that uses a smart contract for dispute resolution, has proven security in UC (Universal Composability) framework, and provides privacy when both parties are honest. We demonstrate, however, that FairSwap’s dispute resolution protocol leaks information to the public and this leakage provides opportunities for the dishonest parties to influence the protocol’s fairness guarantee. We then propose an efficient privacy-enhanced version of Fair-Swap, prove its security and give an implementation and performance evaluation of our proposed system. Our privacy enhancement uses circuit randomization, and we prove its security and privacy in an extension of universal composability model for non-monolithic adversaries that would be of independent interest.
format	article
author	Avizheh Sepideh Haffey Preston Safavi-Naini Reihaneh
author_facet	Avizheh Sepideh Haffey Preston Safavi-Naini Reihaneh
author_sort	Avizheh Sepideh
title	Privacy-preserving FairSwap: Fairness and privacy interplay
title_short	Privacy-preserving FairSwap: Fairness and privacy interplay
title_full	Privacy-preserving FairSwap: Fairness and privacy interplay
title_fullStr	Privacy-preserving FairSwap: Fairness and privacy interplay
title_full_unstemmed	Privacy-preserving FairSwap: Fairness and privacy interplay
title_sort	privacy-preserving fairswap: fairness and privacy interplay
publisher	Sciendo
publishDate	2022
url	https://doaj.org/article/d27e3eaee91a407a8ac7ed75c532f18a
work_keys_str_mv	AT avizhehsepideh privacypreservingfairswapfairnessandprivacyinterplay AT haffeypreston privacypreservingfairswapfairnessandprivacyinterplay AT safavinainireihaneh privacypreservingfairswapfairnessandprivacyinterplay
_version_	1718371325689462784

Privacy-preserving FairSwap: Fairness and privacy interplay

Ejemplares similares