GKMPGroup Key Management Protocol
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Each member in GKMP [19], SAKDA [20] and our scheme is required to store only one key and the GKD needs to store t keys for a group with t members.
In the GKMP, the GKD needs to use t pre-shared keys to encrypt the gorup key for members.
In the GKMP, each member must decrypt the received unicast message to get the gorup key.