Aiming at the problem of poor scalability of existing application layer multicast group key management schemes, a group key management scheme MGKT based on multi-group key tree suitable for large-scale application layer multicast is designed. This scheme manages group members in clusters and limits the update of group keys within the scope of the cluster, thereby reducing the communication overhead of group key management. Analysis and simulation experiments show that MGKT has good scalability without reducing security. Keywords: IP layer multicast; application layer multicast; group key management; scalability
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