Who Let the DOGS Out: anonymous but auditable communications using group signature schemes with distributed opening

Marina Dehez-Clementi*, Jean Christophe Deneuville, Jérôme Lacan, Hassan Asghar, Dali Kaafar

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

Over the past two decades, group signature schemes have been developed and used to enable authenticated and anonymous peer-to-peer communications. Initial protocols rely on two main authorities, Issuer and Opener, which are given substantial capabilities compared to (regular) participants, such as the ability to arbitrarily identify users. Building efficient, fast, and short group signature schemes has been the focus of a large number of research contributions. However, only a few dealt with the major privacy-preservation challenge of group signatures; this consists in providing user anonymity and action traceability while not necessarily relying on a central and fully trusted authority. In this paper, we present DOGS, a privacy-preserving Blockchain-supported group signature scheme with a distributed Opening functionality. In DOGS, participants no longer depend on the Opener entity to identify the signer of a potentially fraudulent message; they instead collaborate and perform this auditing process themselves. We provide a high-level description of the DOGS scheme and show that it provides both user anonymity and action traceability. Additionally, we prove how DOGS is secure against message forgery and anonymity attacks.

Original languageEnglish
Title of host publicationData Privacy Management, Cryptocurrencies and Blockchain Technology
Subtitle of host publicationESORICS 2020 International Workshops, DPM 2020 and CBT 2020 Guildford, UK, September 17–18, 2020, Revised Selected Papers
EditorsJoaquin Garcia-Alfaro, Guillermo Navarro-Arribas, Jordi Herrera-Joancomarti
Place of PublicationCham, Switzerland
PublisherSpringer, Springer Nature
Pages437-446
Number of pages10
ISBN (Electronic)9783030661724
ISBN (Print)9783030661717
DOIs
Publication statusPublished - 2020
Event15th International Workshop on Data Privacy Management, DPM 2020 and 4th International Workshop on Cryptocurrencies and Blockchain Technology, CBT 2020 held in conjunction with 25th European Symposium on Research in Computer Security, ESORICS 2020 - Guildford, United Kingdom
Duration: 17 Sep 202018 Sep 2020

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume12484 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference15th International Workshop on Data Privacy Management, DPM 2020 and 4th International Workshop on Cryptocurrencies and Blockchain Technology, CBT 2020 held in conjunction with 25th European Symposium on Research in Computer Security, ESORICS 2020
CountryUnited Kingdom
CityGuildford
Period17/09/2018/09/20

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