The Research Of Multicast Key Management System

With the rapid development and commercialization of Internet, there emerges more and more multicast applications. Such as , teleconferencing, news distributing, software update, network gameso As a result, securing group communication will become a critical networking issue. In this dissertation , we mainly study the Key Management System of IP Multicast, At first, the concepts of IP Multicast and Key Management are introduced,, At the same time, we also introduce the security architecture of Multicast and protocols of Key Management,,Then many kinds of Key Management Systems of Multicast are discussed and analysed particularly. GKMP is not adapted to large-scale multicast system because of great communication traffic. Although LKH has good performance in extensibility . it can not be applied into the situation that multicast members change frequently. Iolus causes more delay for more middle entities.The dissertation proposes two kinds of Key Management Systems of Multicast based on agent through analysis on Large-scale Key Management Systems, By adding an encryption at the agent, the joining and leaving of multicast members are limited in subgroups. As a result, the two kinds of Key Management Systems have good performance in extensibility and can be applied into the situation that multicast members change frequently. At the end of the dissertation, we propose a new key updating arithmetic in order to reduce traffic communication for key updating in centralized Key Management Systems.