Multicast Group Key Management In Wireless Network

Multicast is an optimal use of bandwidth routing technology, and it allows IP data streams to be send from a source or sources to a number of destinations. Multicast helps control network traffic and reduces network transmission costs, reduce computer processing capacity. Multicast overcomes the bottlenecks inherent in broadcasting and unicasting, and is more applicable to a wide variety of applications environment. As wireless mobile communications and mobile terminal technology of high-speed development, the increasing popularity of wireless networks, multicast technology will be the transition from wired to wireless network environment. Internet Group Management Protocol (IGMP) provides multicast system for members to join and withdraw from the mechanism with the lack of security, and brought the typical three Multicast security problems: Multicast user management, source authentication and Multicast key management. Multicast key management is the biggest difficulty.On the basis of analyzing the traditional key management mechanisms, especially LKH, an improved multicast key management scheme which adapting to the wireless network environment based on the infrastructure was given. The scheme consists of a cable network node as the manager of the multicast group, and is responsible for the establishment of key tree, treatment of the user requests such as the request to join or leave. The base stations are attached to the group managers as sons nodes and the multicast members will be classified according to the base stations the member belonged to, so a lot of unnecessary duplication of overhead will be saved. Moreover, the rekeying approach is based on the one-way function key management scheme, which making encryption and communication overhead decreased. Because of the random mobility of wireless users, a solution to the hand-off problem was proposed to effectively reduce the rekeying overhead caused by the frequent exchanges in various mobile base stations.In order to prove the superiority in performance of the new scheme, the article analyzing the performance in the respect of key encryption overhead, the cost of communication and storage of keys, and compared with Simple Key Distribution Center scheme the traditional Logical Key Hierarchy scheme.Also the proposed scheme was run in the network simulator NS-2, and got the relevant data. Comparison was done among the new scheme and the above-mentioned two options, and the new scheme is to a certain extent in the performance of the superiority, final analysis of the security of the scheme, which guarantees not only the forward secrecy and backward secrecy, but also secure against arbitrary collusion attacks.