Paper 2023/1319 Original: eprint.iacr.org/2023/1319 ↗
On the Black-Box Separation Between Ring Signatures and Public Key Encryptions
Abstract
In this paper, we show that it is impossible to construct a public key encryption scheme (PKE) from a ring signature scheme in a black-box fashion in the standard model. Such an impossibility is highly non-trivial because, to the best of our knowledge, known generic constructions of ring signature scheme are based on public key cryptosystems or in the random oracle model. Technically, we introduce a new cryptographic primitive named indistinguishable multi-designated verifiers signature (IMDVS), and prove that (i) IMDVS is equivalent to PKE, and (ii) it is impossible to construct IMDVS from a ring signature scheme in a generic way. Our result suggests an essential gap between ring signature and group signature, as it is known that group signature implies PKE.
Metadata
- Available format(s)
PDF- Category
- Foundations
- Publication info
- Preprint.
- History
- 2023-09-05: last updated
- 2023-09-05: published
- Short URL
- https://ia.cr/2023/1319
- License
- https://creativecommons.org/licenses/by-sa/4.0/
BibTeX
@misc{cryptoeprint:2023/1319,
author = {Kyosuke Yamashita and Keisuke Hara},
title = {On the Black-Box Separation Between Ring Signatures and Public Key Encryptions},
howpublished = {Cryptology {ePrint} Archive, Paper 2023/1319},
year = {2023},
url = {https://eprint.iacr.org/2023/1319}
}