Paper 2015/020
Simpler Efficient Group Signatures from Lattices
Phong Q. Nguyen, Jiang Zhang, and Zhenfeng Zhang
Abstract
A group signature allows a group member to anonymously sign messages on behalf of the group. In the past few years, new group signatures based on lattice problems have appeared: the most efficient lattice-based constructions are due to Laguillaumie {\it et al.} (Asiacrypt '13) and Langlois {\it et al.} (PKC '14). Both have at least $O(n^2\log^2 n \log N)$-bit group public key and $O(n\log^3 n\log N)$-bit signature, where $n$ is the security parameter and $N$ is the maximum number of group members. In this paper, we present a simpler lattice-based group signature, which is more efficient by a $O(\log N)$ factor in both the group public key and the signature size. We achieve this by using a new non-interactive zero-knowledge (NIZK) proof corresponding to a simple identity-encoding function. The security of our group signature can be reduced to the hardness of SIS and LWE in the random oracle model.
Note: This is the full version of the paper published in PKC 2015.
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- A major revision of an IACR publication in PKC 2015
- Contact author(s)
- jiangzhang09 @ gmail com
- History
- 2015-01-14: revised
- 2015-01-12: received
- See all versions
- Short URL
- https://ia.cr/2015/020
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2015/020,
author = {Phong Q. Nguyen and Jiang Zhang and Zhenfeng Zhang},
title = {Simpler Efficient Group Signatures from Lattices},
howpublished = {Cryptology {ePrint} Archive, Paper 2015/020},
year = {2015},
url = {https://eprint.iacr.org/2015/020}
}