Issuer-Hiding Attribute-Based Credentials

Jan Bobolz, Fabian Eidens, Stephan Krenn*, Sebastian Ramacher, Kai Samelin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

Attribute-based credential systems enable users to authenticate in a privacy-preserving manner. However, in such schemes verifying a user’s credential requires knowledge of the issuer’s public key, which by itself might already reveal private information about the user. In this paper, we tackle this problem by introducing the notion of issuer-hiding attribute-based credential systems. In such a system, the verifier can define a set of acceptable issuers in an ad-hoc manner, and the user can then prove that her credential was issued by one of the accepted issuers – without revealing which one. We then provide a generic construction, as well as a concrete instantiation based on Groth’s structure preserving signature scheme (ASIACRYPT’15) and simulation-sound extractable NIZK, for which we also provide concrete benchmarks in order to prove its practicability. The online complexity of all constructions is independent of the number of acceptable verifiers, which makes it also suitable for highly federated scenarios.

Original languageEnglish
Title of host publicationCryptology and Network Security - 20th International Conference, CANS 2021, Proceedings
EditorsMauro Conti, Marc Stevens, Stephan Krenn
PublisherSpringer Science and Business Media Deutschland GmbH
Pages158-178
Number of pages21
ISBN (Print)9783030925475
DOIs
Publication statusPublished - 9 Dec 2021
Event20th International Conference on Cryptology and Network Security, CANS 2021 - Virtual, Online
Duration: 13 Dec 202115 Dec 2021

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume13099 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference20th International Conference on Cryptology and Network Security, CANS 2021
CityVirtual, Online
Period13/12/2115/12/21

Keywords / Materials (for Non-textual outputs)

  • anonymous credentials
  • authentication
  • cryptographic protocols
  • issuer-hiding
  • privacy-preserving

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