Paper 2022/190 Original: eprint.iacr.org/2022/190 ↗
Short-lived zero-knowledge proofs and signatures
Abstract
We introduce the short-lived proof, a non-interactive proof of knowledge with a novel feature: after a specified period of time, the proof is no longer convincing. This time-delayed loss of soundness happens "naturally" without further involvement from the prover or any third party. We propose formal definitions for short-lived proofs as well as the special case of short-lived signatures. We show several practical constructions built using verifiable delay functions (VDFs). The key idea in our approach is to allow any party to forge any proof by executing a large sequential computation. Some constructions achieve a stronger property called reusable forgeability in which one sequential computation allows forging an arbitrary number of proofs of different statements. Our work also introduces two novel types of VDFs, re-randomizable VDFs and zero-knowledge VDFs, which may be of independent interest.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2022-02-20: last updated
- 2022-02-20: published
- Short URL
- https://ia.cr/2022/190
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2022/190,
author = {Arasu Arun and Joseph Bonneau and Jeremy Clark},
title = {Short-lived zero-knowledge proofs and signatures},
howpublished = {Cryptology {ePrint} Archive, Paper 2022/190},
year = {2022},
url = {https://eprint.iacr.org/2022/190}
}