Paper 2024/128
Non-Binding (Designated Verifier) Signature
, University of LuxembourgAbstract
We argue that there are some scenarios in which plausible deniability might be desired for a digital signature scheme. For instance, the non-repudiation property of conventional signature schemes is problematic in designing an Instant Messaging system (WPES 2004). In this paper, we formally define a non-binding signature scheme in which the Signer is able to disavow her own signature if she wants, but, the Verifier is not able to dispute a signature generated by the Signer. That is, the Signer is able to convince a third party Judge that she is the owner of a signature without disclosing her secret information. We propose a signature scheme that is non-binding and unforgeable. Our signature scheme is post-quantum secure if the underlying cryptographic primitives are post-quantum secure. In addition, a modification to our nonbinding signature scheme leads to an Instant Messaging system that is of independent interest.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Preprint.
- Keywords
- Designated Verifier SignaturePlausible DeniabilityEnd-to-End Encryption.
- Contact author(s)
- eebrahimi pqc @ gmail com
- History
- 2024-01-30: approved
- 2024-01-29: received
- See all versions
- Short URL
- https://ia.cr/2024/128
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2024/128,
author = {Ehsan Ebrahimi},
title = {Non-Binding (Designated Verifier) Signature},
howpublished = {Cryptology ePrint Archive, Paper 2024/128},
year = {2024},
note = {\url{https://eprint.iacr.org/2024/128}},
url = {https://eprint.iacr.org/2024/128}
}
