Paper 2024/2078 Original: eprint.iacr.org/2024/2078 ↗
Strongly Secure Universal Thresholdizer
Abstract
A universal thresholdizer (UT), constructed from a threshold fully homomorphic encryption by Boneh et. al , Crypto 2018, is a general framework for universally thresholdizing many cryptographic schemes. However, their framework is insufficient to construct strongly secure threshold schemes, such as threshold signatures and threshold public-key encryption, etc. In this paper, we strengthen the security definition for a universal thresholdizer and propose a scheme which satisfies our stronger security notion. Our UT scheme is an improvement of Boneh et. al ’s construction at the level of threshold fully homomorphic encryption using a key homomorphic pseudorandom function. We apply our strongly secure UT scheme to construct strongly secure threshold signatures and threshold public-key encryption.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2024-12-26: last updated
- 2024-12-26: published
- Short URL
- https://ia.cr/2024/2078
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2024/2078,
author = {Ehsan Ebrahimi and Anshu Yadav},
title = {Strongly Secure Universal Thresholdizer},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/2078},
year = {2024},
url = {https://eprint.iacr.org/2024/2078}
}