A Hierarchical Multicast Key Distribution Protocol

In secure group communication, keys (GK) are used to ensure the confidentiality of communication. The key distribution (GKD) is responsible for updating and distributing new when membership changes. Most well-known GKD protocols based on a logical hierarchy (LKH), where only one controller (GC) used. These have various issues, including single point failure, meaning that GC often has huge workload can be easily overwhelmed. this paper, we propose hierarchical multicast protocol supports multi-level controllers manage group. Each just needs next-level nodes, if fails, superior replace it with minimal work. proposed effectively balances work controllers, greatly improves reliability distribution, also allows members build dynamic conferences without controllers. We provide security proof in symbolic model compare other terms efficiency, functionality, security.