Abstract
Mobile WiMAX (IEEE 802.16e) is an emerging technology for wireless broadband access network. It provides wider converge and higher bandwidth than conventional wireless technologies. Multicast and Broadcast (M&B) in WiMAX are suitable for multimedia applications such as Pay-TV system because multimedia providers can efficiently distribute the same contents to the users within the same M&B group. Although IEEE 802.16e has defined Multicast/Broadcast Rekeying Algorithm (MBRA) to secure M&B, recent research indicates that MBRA is insecure. In this paper, we propose an efficient rekeying scheme which depends on Linear Ordering of Receivers (LORE) to protect M&B group communication. Our scheme requires O(1) messages for rekeying and addresses the security problem of MBRA. Therefore, our rekeying scheme is suitable for protecting large dynamic groups such as M&B groups.