Research And Realization Of Secure Multicast Based On GDOI

With the development of the next Internet technology, The transmissions of audio and video are becoming a very important implementation. When applied unicast technology in implementing these heavy load applications, the increasing of users makes bandwidth consumed as quickly as possible, at the same time the service level will be declined, so it's difficult to implement heavy load applications with unicast. Multicast technology overcomes the disadvantage of unicast in implementing these heavy load applications, Now Multicast technology is researched and implemented widly.Multicast technology applies the method of group transmissions, using Router to copy data packages, it promised only one data package in every link at any time, and saved bandwidth. This characteristic makes Multicast technology having enormous excellence on the communications of large group.IPv6 has many advantages, such as 128-bit address space; address auto-configuration and security authorization mechanism. It will be the normal protocol of the next Internet replacing IPv4. Multicast of IPv6 is an important and integrant part of IPv6 stack, so it's necessary to research and implement Multicast applications on the based of IPv6.Security is the key fact of disposing Multicast technology. There are many requirements on secure multicast, Specially, in the case of the group members dynamic changing,they are important to know that how to ensure the security of group communications and how to control the joined/left of group members. So it's necessary to research and implement relevant frame of key management.This paper analyzes the base of IPv6 Multicast technology and studies the multicast group security architecture and relational protocols. On the based of analyzing the existing key management scheme, it proposes a key management scheme based on subgroup for secure multicast. This scheme collects the good parts of centralized and distributed types, not only reduces the traffic and complexity when distributing group key but also improves the speed of transmitting Multicast data. At the same time, it describes an implement of secure multicast, which based on the GDOI protocol and the scheme proposed in this paper, this scheme has tested. Finally, the objection of IP secure multicast is mentioned and the next research is prospected.