Paper 2022/1258
Tightly Secure Chameleon Hash Functions in the Multi-User Setting and Their Applications
Abstract
We define the security notion of (strong) collision resistance for chameleon hash functions in the multi-user setting ((S-)MU-CR security). We also present three constructions, CHF_dl, CHF_rsa and CHF_fac, and prove their tight S-MU-CR security based on the discrete logarithm, RSA and factoring assumptions, respectively. In applications, our tightly S-MU-CR secure chameleon hash functions help us to lift a signature scheme from (weak) unforgeability to strong unforgeability in the multi-user setting, and the security reduction is tightness preserving. Furthermore, they can also be used to construct tightly secure online/offline signatures, chameleon signatures and proxy signatures, etc., in the multi-user setting.
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- Published elsewhere. ACISP 2020
- DOI
- 10.1007/978-3-030-55304-3_36
- Keywords
- Chameleon hash functions Tight security Multi-user setting Signatures
- Contact author(s)
-
xiangyu_liu @ sjtu edu cn
slliu @ sjtu edu cn
dwgu @ sjtu edu cn - History
- 2022-09-26: approved
- 2022-09-22: received
- See all versions
- Short URL
- https://ia.cr/2022/1258
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2022/1258,
author = {Xiangyu Liu and Shengli Liu and Dawu Gu},
title = {Tightly Secure Chameleon Hash Functions in the Multi-User Setting and Their Applications},
howpublished = {Cryptology ePrint Archive, Paper 2022/1258},
year = {2022},
doi = {10.1007/978-3-030-55304-3_36},
note = {\url{https://eprint.iacr.org/2022/1258}},
url = {https://eprint.iacr.org/2022/1258}
}
