Flexible Group Key Exchange with On-Demand Computation of Subgroup Keys (Full Version)
Michel Abdalla⋆, Mark Manulis, David Pointcheval · 2010
Modern multi-user communication systems, including popular instant messaging tools, social network platforms, and cooperative-work applications, oer exible forms of com- munication and exchange of data. At any time point concurrent communication sessions involv- ing dierent subsets of users can be invoked. The traditional tool for achieving security in a multi-party communication environment are group key exchange (GKE) protocols that provide participants with a secure group key for their subsequent communication. Yet, in communica- tion scenarios where various user subsets may be involved in dierent sessions the deployment of classical GKE protocols has clear performance and scalability limitations as each new session should be preceded by a separate execution of the protocol. The motivation of this work is to study the possibility of designing more exible GKE protocols allowing not only the computation