Paper 2023/1319
On the Black-Box Separation Between Ring Signatures and Public Key Encryptions
, Osaka UniversityAbstract
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.
- Keywords
- black-box separationring signaturepublic key encryption
- Contact author(s)
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yamashita @ ist osaka-u ac jp
hara-keisuke @ aist go jp - History
- 2023-09-08: approved
- 2023-09-05: received
- See all versions
- Short URL
- https://ia.cr/2023/1319
- License
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CC BY-SA
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},
note = {\url{https://eprint.iacr.org/2023/1319}},
url = {https://eprint.iacr.org/2023/1319}
}
