Paper 2023/077 Original: eprint.iacr.org/2023/077 ↗
Lattice-Based Blind Signatures: Short, Efficient, and Round-Optimal
Abstract
We give a construction of a 2-round blind signature scheme based on the hardness of standard lattice problems (Ring/Module-SIS/LWE and NTRU) with a signature size of 22 KB. The protocol is round-optimal and has a transcript size that can be as small as 60 KB. This blind signature is around $4$ times shorter than the most compact lattice-based scheme based on standard assumptions of del Pino and Katsumata (Crypto 2022) and around $2$ times shorter than the scheme of Agrawal et al. (CCS 2022) based on their newly-proposed one-more-SIS assumption. We also give a construction of a ``keyed-verification'' blind signature scheme in which the verifier and the signer need to share a secret key. The signature size in this case is only $48$ bytes, but more work needs to be done to explore the efficiency of the protocol which generates the signature.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2023-01-24: last updated
- 2023-01-23: published
- Short URL
- https://ia.cr/2023/077
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2023/077,
author = {Ward Beullens and Vadim Lyubashevsky and Ngoc Khanh Nguyen and Gregor Seiler},
title = {Lattice-Based Blind Signatures: Short, Efficient, and Round-Optimal},
howpublished = {Cryptology {ePrint} Archive, Paper 2023/077},
year = {2023},
url = {https://eprint.iacr.org/2023/077}
}