HKM: A hybrid key management scheme for secure mobile multicast

For successfully deploying multicast services in the mobile environment, security infrastructures must be developed that manage the keys needed to provide access control to content. In this paper, a hybrid key management (HKM) tree with topology matching (TM) subtrees and topology independent (TI) subtrees has been proposed. In order to reduce the communication burden of rekeying caused by handoffs, the HKM tree adopts different key management schemes to manage high mobility users and low mobility users. Performance analysis and experimental results indicate a great reduction in the communication cost compared to key management trees that are independent of the network topology.