International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Jesús F. Almansa

Affiliation: NTT Inf. Sharing Platform

Publications

Year
Venue
Title
2006
EUROCRYPT
2005
EPRINT
The Full Abstraction of the UC Framework
Jes{\'u}s F. Almansa
We prove that security in the Universal Composability framework (UC) is equivalent to security in the probabilistic polynomial time calculus ppc. Security is defined under active and adaptive adversaries with synchronous and authenticated communication. In detail, we define an encoding from machines in UC to processes in ppc and show it is fully abstract with respect to UC-security and ppc-security, i.e., we show a protocol is UC-secure iff its encoding is ppc-secure. However, we restrict security in ppc to be quantified not over all possible contexts, but over those induced by UC-environments under encoding. This result is not overly-simplifying security in ppc, since the threat and communication models we assume are meaningful in both practice and theory.