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Group key transfer protocols depend on a mutually trusted Key Generation Center (KGC) to transport the group key to all group members secretly. This approach requires that a trusted sever be set up, and it incurs communication overhead costs. In addition, the existing group key transfer protocols based on secret sharing all use threshold schemes that need to compute a t-degree interpolating polynomial to encrypt and decrypt the secret group key, then it increases the computational complexity of system. In this paper, the authors first present a novel group key transfer protocol without an online KGC, which is based on DH key agreement and a perfect Linear Secret Sharing Scheme (LSSS).
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