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Who let the DOGS out: Anonymous but Auditable communications using Group Signature schemes with Distributed Opening

Dehez-Clementi, Marina and Deneuville, Jean-Christophe and Lacan, Jérôme and Asghar, Hassan and Kaafar, Mohamed Ali Who let the DOGS out: Anonymous but Auditable communications using Group Signature schemes with Distributed Opening. (2020) In: 4th International Workshop on Cryptocurrencies and Blockchain Technology - CBT 2020, 17 September 2020 - 18 September 2020 (Guildford, United Kingdom).

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Official URL: https://doi.org/10.1007/978-3-030-66172-4_28

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.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Part of the Lecture Notes in Computer Science book series (LNCS, volume 12484)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Ecole Nationale de l'Aviation Civile - ENAC (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Macquarie University (AUSTRALIA)
Other partners > Commonwealth Scientific and Industrial Research Organisation - CSIRO (AUSTRALIA)
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Deposited On:23 Oct 2020 14:56

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