Generic construction of deniable group key establishment from group key establishment

Abstract

A generic way to construct a deniable group key establishment protocol from an unauthenticated group key es-tablishment protocol was proposed.The construction could be seen as a compiler.By using Schnorr's zero-knowledge identification scheme,this compiler could transform an unauthenticated group key establishment to a deniable group key establishment protocol with only additional two round communications and one round verification.It is very efficient and practical.The security and deniability proof is in the Random Oracle model.A concrete transforming example of the con-struction was also presented.