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This paper considers the key management for secure multicast in the Logical Key Hierarchy (LKH) model and proposes a methodology to establish the minimal key bit length that guarantees a specified degree of confidentiality for the multicast communications managed within this model. The authors also introduce the concepts of information lifetime and of information dependence to formalize the intuition that keys should be longer, and thus stronger, when used to encrypt "Important" information, that is information (including other keys) that needs to be kept confidential for a longer period.
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