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This paper proposes a family of key management schemes for broadcast encryption based on a novel underlying structure - Time Vary- ing Heterogeneous Logical Key Hierarchy (TVH-LKH). Note that the main characteristics of the previously reported key management schemes include the following: employment of a static underlying structure for key management, and addressing the subset covering problem over the entire underlying structure. Oppositely, the main underlying ideas for developing of the novel key management schemes based on TVH-LKH in- clude the following: (i) employment of a reconflgurable underlying struc- ture; and (ii) employment of a divide-and-conquer approach related to the underlying structure and an appropriate communications-storage- processing trade-ofi (for example, a small increase of the communication overload and large reduction of the storage and processing overload) for addressing the subset covering problem and optimization of the over- loads. The design is based on a set of "static" keys at a receiver (stateless receiver) which are used in all possible reconflguration of the underly- ing structure for key management, and accordingly, in a general case, a key plays difierent roles depending on the employed underlying struc- ture. A particular family of the components for developing TVH-LKH, is also proposed and discussed. The proposed technique is compared with the recently reported schemes, and the advantages of the novel one are pointed out.

Key Management Schemes for Stateless Receivers Based on Time Varying Heterogeneous Logical Key Hierarchy