TY - GEN
T1 - Who Let the DOGS Out
T2 - 15th 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
AU - Dehez-Clementi, Marina
AU - Deneuville, Jean Christophe
AU - Lacan, Jérôme
AU - Asghar, Hassan
AU - Kaafar, Dali
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85101860965&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-66172-4_28
DO - 10.1007/978-3-030-66172-4_28
M3 - Conference proceeding contribution
AN - SCOPUS:85101860965
SN - 9783030661717
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 437
EP - 446
BT - Data Privacy Management, Cryptocurrencies and Blockchain Technology
A2 - Garcia-Alfaro, Joaquin
A2 - Navarro-Arribas, Guillermo
A2 - Herrera-Joancomarti, Jordi
PB - Springer, Springer Nature
CY - Cham, Switzerland
Y2 - 17 September 2020 through 18 September 2020
ER -