Paper 2024/1406 Original: eprint.iacr.org/2024/1406 ↗
Blind Multisignatures for Anonymous Tokens with Decentralized Issuance
Abstract
We propose the first constructions of anonymous tokens with decentralized issuance. Namely, we consider a dynamic set of signers/issuers; a user can obtain a token from any subset of the signers, which is publicly verifiable and unlinkable to the issuance process. To realize this new primitive we formalize the notion of Blind Multi-Signatures (BMS), which allow a user to interact with multiple signers to obtain a (compact) signature; even if all the signers collude they are unable to link a signature to an interaction with any of them. We then present two BMS constructions, one based on BLS signatures and a second based on discrete logarithms without pairings. We prove security of both our constructions in the Algebraic Group Model. We also provide a proof-of-concept implementation and show that it has low-cost verification, which is the most critical operation in blockchain applications.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2024-09-11: last updated
- 2024-09-09: published
- Short URL
- https://ia.cr/2024/1406
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2024/1406,
author = {Ioanna Karantaidou and Omar Renawi and Foteini Baldimtsi and Nikolaos Kamarinakis and Jonathan Katz and Julian Loss},
title = {Blind Multisignatures for Anonymous Tokens with Decentralized Issuance},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/1406},
year = {2024},
url = {https://eprint.iacr.org/2024/1406}
}