earticle

영어

Key management in multicast dynamic groups, where users can leave or join at their ease is one of the most crucial and essential part of secure communication. Because communication bandwidth, storage memory, and computational power are limited resources, group key management schemes for scalable secure multicast communications have to consider these factors however, most of proposed key management schemes focus on guarantying secure distribution of keys. Even though security assurance is critical, reducing the number of update messages, number of stored keys and computational load also needs equivalent attention. Scalability, security, computation, and communication complexities are some of the tradeoffs. Here, we propose an efficient secure scheme in such a way that solves these problems and that can be implemented easily. In our scheme, we applied very simple mathematical concept with modulo and XOR operations in order to make the system simple for implementation and management. As a novel feature, the scheme is scalable with key update message of order O(1) - logM N, storage overhead of order O(1) and computational load of order O(log(N/M))- O(1).