A Survey on Multicast rekeying for secure group communication

For any multicast group communication, group key agreement was found to be challenging because of its dynamic nature. Group key management scheme are of either distributed, centralized or hybrid architecture. Although many solutions have been proposed to handle group key changes, this paper gives the aspects of rekeying performed by those schemes. In the entire existing scheme the primary security mechanism of group communication is achieved by conventional encryption algorithms, in which key distribution and rekeying of the group key was done by Group controller. This paper explores the various algorithms along with the performances and derives an improved method. In this paper we propose a distributed key distribution scheme, using a logical group key structure, PFMH tree, and the concept of virtual user position. This approach ensures the forward secrecy and backward secrecy, reduces the rekeying complexity, communication, computation and storage complexity and time cost.