Paper 2009/434 Original: eprint.iacr.org/2009/434 ↗
Tight Bounds for Protocols with Hybrid Security
Abstract
We consider broadcast and multi-party computation (MPC) in the setting where a digital signature scheme and a respective public-key infrastructure (PKI) are given among the players. However, neither the signature scheme nor the PKI are fully trusted. The goal is to achieve unconditional (PKI- and signature-independent) security up to a certain threshold, and security beyond this threshold under stronger assumptions, namely, that the forgery of signatures is impossible and/or that the given PKI is not under adversarial control. We give protocols for broadcast and MPC that achieve an optimal trade-off between these different levels of security.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2010-09-15: last updated
- 2009-09-08: published
- Short URL
- https://ia.cr/2009/434
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2009/434,
author = {Matthias Fitzi and Dominik Raub},
title = {Tight Bounds for Protocols with Hybrid Security},
howpublished = {Cryptology {ePrint} Archive, Paper 2009/434},
year = {2009},
url = {https://eprint.iacr.org/2009/434}
}