Research On Some Key Issues Of Multicast Security

With the development of Internet and popularity of broadband network, multicast communication is getting into wide application because of its efficient and timely data transmission. Multicast is a communication technique between unicast and broadcast, which have the advantage of economizing bandwidth, easing network burden and decreasing congestion.Multicast security is an urgent problem now, of which group key management and authentication are two core problems. Following are the main results of this thesis:1 Detailedly analyze some related schemes concerning group key management and authentication, especially logical key hierarchy(LKH) and one-way function tree(OFT). We point out the reasons that OFT fails to provide forward and backward security.2 A new group key management scheme based on grouping and management layer by layer is proposed. In comparison with the previous schemes, we find that it can prevent single point failure and also has good performance of key storage and scalable property.3 A new group key management scheme based on a full and balanced tree scheme in conjunction with one-way hash chain is proposed. By comparison, we find that it has good performance of low re-key communication costs and scalable property.4 Analyze some authentication schemes , especially some based on digital signature.