Paper 2026/2402 Original: eprint.iacr.org/2026/2402 ↗
Revisiting Lattice-based Blind Signatures Again
Abstract
We show an attack on a lattice-based blind signature proposed in Crypto'20. Formally it is a linear hash function based framework with a lattice-based instantiation. We first notice a bug in their security proof of blindness, which is overlooked these years. Then, we develop an attack under the honest key and the honest-but-curious signer setting against the blindness notion of the schemes by exploiting the coorelations between the leaves of the tree. We also discuss how to repair the scheme.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2026-10-07: last updated
- 2026-10-07: published
- Short URL
- https://ia.cr/2026/2402
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2026/2402,
author = {Yi-Fu Lai and Yu Yu},
title = {Revisiting Lattice-based Blind Signatures Again},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/2402},
year = {2026},
url = {https://eprint.iacr.org/2026/2402}
}