Paper 2024/494
HW-token-based Common Random String Setup
Abstract
In the common random string model, the parties executing a protocol have access to a uniformly random bit string. It is known that under standard intractability assumptions, we can realize any ideal functionality with universally composable (UC) security if a trusted common random string (CrS) setup is available. It was always a question of where this CrS should come from since the parties provably could not compute it themselves. Trust assumptions are required, so minimizing the level of such trust is a fundamentally important task. Our goal is to design a CrS setup protocol under a weakened trust assumption. We present an HW-token-based CrS setup for 2-party cryptographic protocols using a single token only. Our protocol is a UC-secure realization of ideal common random string functionality FCrS. We show the multiple-session security of the protocol and we also consider the multi-party extension of it.
Metadata
- Available format(s)
-
PDF
- Category
- Applications
- Publication info
- Preprint.
- Keywords
- Common Random String setuptamperproof hardware tokenUC-securitySigma protocols
- Contact author(s)
- vajda @ hit bme hu
- History
- 2024-04-01: approved
- 2024-03-28: received
- See all versions
- Short URL
- https://ia.cr/2024/494
- License
-
CC0
BibTeX
@misc{cryptoeprint:2024/494,
author = {István Vajda},
title = {{HW}-token-based Common Random String Setup},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/494},
year = {2024},
url = {https://eprint.iacr.org/2024/494}
}
