Welcome to the resource topic for 2009/434
Title:
Tight Bounds for Protocols with Hybrid Security
Authors: Matthias Fitzi, Dominik Raub
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.
ePrint: https://eprint.iacr.org/2009/434
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