A M-dimensional Sphere Multicast Rekeying Scheme

Based on analyzing three representative multicast rekeying scheme, such as LKH, OFT and OKD, in this paper, a M-dimensional sphere rekeying scheme for dynamics multicast is put forward. In this new scheme, GC (group key controller) can utilize the cooperation of sibling nodes by one common father as rekeying, when new member joins in or old member leaves, all of sibling nodes will generate a new KEK (key encrypt key) of their father node. By this way, our scheme can improve communication cost special for member leaving, at the same time forward and backward security is ensured. Based on M-dimensional geometry sphere rekeying scheme, we put forward a batch rekeying scheme, by simulation, it is proved that the communication cost of rekeying is reduced, so this scheme can be used in the scene of large-scale dynamics multicast.