An Efficient Key Management Scheme For Dynamic Multicast Groups

Multicast is an important support for next-generation Internet application technology, and security of the multicast is one of the most important subjects for group communication to resolve.At present, people have proposed a variety of key management program, and use different group key update scheme to deal with the dynamics group. The basic structure of group key management includes two layers and multilayer structures. For the larger system resource overhead and longer system delay of multi-layer structure, it is not suitable for large dynamic group whose membership changes frequently. Therefore, now multicast key management scheme which is suitable for the membership changes frequently in a large dynamic multicast is limited.This paper presents a new key management scheme which based on a two-tier structure key management, and the security hash function theory.The article related to multicast key management and key algorithm technology, achieved the following results:1. I design a Multicast Key Management Scheme. This scheme based on the structure of IKAM and improved it. Structure of the sub-group in IKAM will be improved, the original sub-group structure will be replaced by a binary balanced tree. Since the proposed key renew algorithm RH has higher efficiency of key distribution, i use RH algorithm as the key update algorithm in sub-group. And it will further improve the efficiency of key update, reduce the computational overhead of communication and the utilization of network bandwidth.2. Introduce a new key distribution scheme, RH (Random and Hash) key distribution scheme, and applied as a key distribution algorithm in Area, it can resist any number of user attacks together. When the group key is updating, it requires less communication messages and computational overhead. It also can reduce the occupation of network bandwidth and reduce computing costs of the group control center GC and the users.Finally, the simulation results show that the RH key update algorithm and key management solutions in the key storage, encryption computation, network traffic and other properties are better than other similar programs, then it is suitable comparatively to large dynamic multicast environment, with better theoretical research and practical application.