Paper 2024/1874
Multi-Holder Anonymous Credentials from BBS Signatures
Abstract
The eIDAS 2.0 regulation aims to develop interoperable digital identities for European citizens, and it has recently become law. One of its requirements is that credentials be unlinkable. Anonymous credentials (AC) allow holders to prove statements about their identity in a way that does not require to reveal their identity and does not enable linking different usages of the same credential. As a result, they are likely to become the technology that provides digital identity for Europeans.
Any digital credential system, including anonymous credentials, needs to be secured against identity theft and fraud. In this work, we introduce the notion of a multi-holder anonymous credential scheme that allows issuing shares of credentials to different authentication factors (or ``holders''). To present the credential, the user's authentication factors jointly run a threshold presentation protocol. Our definition of security requires that the scheme provide unforgeability: the adversary cannot succeed in presenting a credential with identity attributes that do not correspond to an identity for which the adversary controls at least
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Preprint.
- Keywords
- Anonymous CredentialsMultiparty ComputationVerifiable Presentation
- Contact author(s)
-
andrea flamini @ unitn it
eysa_lee @ brown edu
anna_lysyanskaya @ brown edu - History
- 2024-11-18: approved
- 2024-11-16: received
- See all versions
- Short URL
- https://ia.cr/2024/1874
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2024/1874, author = {Andrea Flamini and Eysa Lee and Anna Lysyanskaya}, title = {Multi-Holder Anonymous Credentials from {BBS} Signatures}, howpublished = {Cryptology {ePrint} Archive, Paper 2024/1874}, year = {2024}, url = {https://eprint.iacr.org/2024/1874} }