A Digital Cash Paradigm with Valued and No-Valued e-Coins

Digital cash is a form of money that is stored digitally. Its main advantage when compared to traditional credit or debit cards is the possibility of carrying out anonymous transactions. Diverse digital cash paradigms have been proposed during the last decades, providing different approaches to avoi...

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Autores principales:	Ricard Borges, Francesc Sebé
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cryptography digital cash privacy Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/3b0473854ba94769a761957a6a0d881d
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spelling	oai:doaj.org-article:3b0473854ba94769a761957a6a0d881d2021-11-11T14:59:59ZA Digital Cash Paradigm with Valued and No-Valued e-Coins10.3390/app112198922076-3417https://doaj.org/article/3b0473854ba94769a761957a6a0d881d2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9892https://doaj.org/toc/2076-3417Digital cash is a form of money that is stored digitally. Its main advantage when compared to traditional credit or debit cards is the possibility of carrying out anonymous transactions. Diverse digital cash paradigms have been proposed during the last decades, providing different approaches to avoid the double-spending fraud, or features like divisibility or transferability. This paper presents a new digital cash paradigm that includes the so-called no-valued e-coins, which are e-coins that can be generated free of charge by customers. A vendor receiving a payment cannot distinguish whether the received e-coin is valued or not, but the customer will receive the requested digital item only in the former case. A straightforward application of bogus transactions involving no-valued e-coins is the masking of consumption patterns. This new paradigm has also proven its validity in the scope of privacy-preserving pay-by-phone parking systems, and we believe it can become a very versatile building block in the design of privacy-preserving protocols in other areas of research. This paper provides a formal description of the new paradigm, including the features required for each of its components together with a formal analysis of its security.Ricard BorgesFrancesc SebéMDPI AGarticlecryptographydigital cashprivacyTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9892, p 9892 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cryptography digital cash privacy Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	cryptography digital cash privacy Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Ricard Borges Francesc Sebé A Digital Cash Paradigm with Valued and No-Valued e-Coins
description	Digital cash is a form of money that is stored digitally. Its main advantage when compared to traditional credit or debit cards is the possibility of carrying out anonymous transactions. Diverse digital cash paradigms have been proposed during the last decades, providing different approaches to avoid the double-spending fraud, or features like divisibility or transferability. This paper presents a new digital cash paradigm that includes the so-called no-valued e-coins, which are e-coins that can be generated free of charge by customers. A vendor receiving a payment cannot distinguish whether the received e-coin is valued or not, but the customer will receive the requested digital item only in the former case. A straightforward application of bogus transactions involving no-valued e-coins is the masking of consumption patterns. This new paradigm has also proven its validity in the scope of privacy-preserving pay-by-phone parking systems, and we believe it can become a very versatile building block in the design of privacy-preserving protocols in other areas of research. This paper provides a formal description of the new paradigm, including the features required for each of its components together with a formal analysis of its security.
format	article
author	Ricard Borges Francesc Sebé
author_facet	Ricard Borges Francesc Sebé
author_sort	Ricard Borges
title	A Digital Cash Paradigm with Valued and No-Valued e-Coins
title_short	A Digital Cash Paradigm with Valued and No-Valued e-Coins
title_full	A Digital Cash Paradigm with Valued and No-Valued e-Coins
title_fullStr	A Digital Cash Paradigm with Valued and No-Valued e-Coins
title_full_unstemmed	A Digital Cash Paradigm with Valued and No-Valued e-Coins
title_sort	digital cash paradigm with valued and no-valued e-coins
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/3b0473854ba94769a761957a6a0d881d
work_keys_str_mv	AT ricardborges adigitalcashparadigmwithvaluedandnovaluedecoins AT francescsebe adigitalcashparadigmwithvaluedandnovaluedecoins AT ricardborges digitalcashparadigmwithvaluedandnovaluedecoins AT francescsebe digitalcashparadigmwithvaluedandnovaluedecoins
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A Digital Cash Paradigm with Valued and No-Valued e-Coins

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