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Many emerging applications that depend on secure group communications demand the privacy of participants and access control at the multicast server. The multicast and broadcast services in IEEE 802.16 are efficient and power saving mechanisms, which no doubt also provide subscribers with strong and powerful security protection from the theft of service by encrypting broadcast connections between Subscriber Station (SS), Relay Station (RS), Non-transparent Relay Station (NRS) and Multi-hop Relay Base Station (MR-BS). However, the existing Multicast and Broadcast Rekeying Algorithm (MBRA) not only facing forward secrecy, backward secrecy and scalability problems for IEEE 802.16e but also for multi-hop relay based networks both in centralized as well as distributed zone.
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