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Strongly Secure Universal Thresholdizer
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| Conference: | ASIACRYPT 2024 |
| 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 in 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. |
BibTeX
@inproceedings{asiacrypt-2024-34711,
title={Strongly Secure Universal Thresholdizer},
publisher={Springer-Verlag},
author={Ehsan Ebrahimi and Anshu Yadav},
year=2024
}