An Efficient Inter-Domain Group Key Management Scheme

Abstract

Multicast perfectly befits many internet applications such as teleconference, real-time information distribution, and so on. Without guarantee of security, however, usage of multicast will be limited only to academic research. One challenge of multicast security is group key management, because the overhead of multicast key management gets much heavier while the size of a group growing larger. Even worse, if membership of a group changes frequently, overhead of re-keying becomes a critical issue of group key management. In this paper, we propose a scalable and efficient group key management scheme which addresses on re-keying strategy for highly fluctuating multicast groups. We use a two-level hashing method to organize multicast key chains. Our scheme can reduce huge computation and communication overhead of re-keying when members leave.