Attribute Based Pseudonyms: Anonymous and Linkable Scoped Credentials

Francesc Garcia-Grau, Jordi Herrera-Joancomartí and Aleix Dorca Josa
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Francesc Garcia-Grau: Escola de Doctorat, Universitat d’Andorra, AD600 Sant Julià de Lòria, Andorra
Jordi Herrera-Joancomartí: Departament d’Enginyeria de la Informació i les Comunicacions, Universitat Autònoma de Barcelona, CYBERCAT-Center, 08193 Barcelona, Spain
Aleix Dorca Josa: Departament de Serveis Informàtics, Universitat d’Andorra, AD600 Sant Julià de Lòria, Andorra

Mathematics, 2022, vol. 10, issue 15, 1-14

Abstract: Attribute-based credentials (ABCs) provide an efficient way to transfer custody of personal and private data to the final user, while minimizing the risk of sensitive data revelation and thus granting anonymity. Nevertheless, this method cannot detect whether one attribute has been used more than once without compromising anonymity when the emitter and consumer collude with one another. The protocol proposed in this article deals with this issue by using a modification of ZSS pairing-based short signatures over elliptic curves and Verheul’s self-blinded credentials scheme. Each user can generate an identifier (pseudonym) that is unique and verifiable by everyone in a given scope, without compromising anonymity. However, the identifier cannot be reused in the same scope, since such reuse would be detected.

Keywords: attribute-based credentials; pseudonyms; privacy-preserving credentials; self-blinded scheme; security proofs; user-centered system (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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