Secure multicast in various scenarios of WirelessMAN

Secure and Efficient Multicast Rekeying Approach for Non-Transparent Relay-Based IEEE 802.16 Networks

“…But in [3], [8] and [9], the authors have shown that the MBRA fails to ensure forward and backward secrecy. Also the MBRA is not scalable for large group as the message complexity is O(n), which means that it increases proportionally with the number of group members, n. Scalable multicast key distribution and group key management protocols specification are amongst few works in secure multicast and broadcast [3] [8]. Kronos [10] takes a unique periodical rekeying approach that rekeys the group only at specified time intervals.…”

“…In the event of member change, a rekey message is generated containing each of the new sets of keys encrypted with its respective node's children keys. In [4] and [8], the authors identify the lack of forward and backward secrecy in MBRA architecture. They also discuss the scalability issues in MBRA.…”

An Efficient Rekeying Scheme for Multicast and Broadcast (M&B) in Mobile WiMAX

“…BS → G : {GT EK t } GKEK , t > 1 However, Xu et al [16] shows that MBRA lacks forward and backward secrecy. This is because the key update commands are periodically triggered without reflecting the changes in group membership.…”

“…Worldwide Interoperability for Microwave Access (WiMAX) [2] is a forum responsible for certifying the products of IEEE 802. 16. IEEE 802.16e is also called mobile WiMAX due to its mobility.…”

“…Multicast/Broadcast (M&B) in WiMAX is especially suitable for multimedia applications such as Pay-TV system because multimedia providers can efficiently distribute the same contents to the users within a M&B group. IEEE 802.16e [1] defines Multicast and Broadcast Rekeying Algorithm (MBRA) to secure M&B group communication; however, Xu et al [16] shows that MBRA lacks forward and backward secrecy because the key updates in MBRA are periodically triggered without reflecting the changes in group membership.…”