Key management method
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsFredrik Lindholm, Mattias Johanson, Karl Norrman
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Abstract
The present invention relates to a key management method to establish selective secret information in multiple disjoint groups, more specifically to a method of reducing the broadcast size in access hierarchies and localize and facilitate management in said access hierarchies. The key management method selects a number of subgroups. Each subgroup supports an instance of a key distribution method for receiving distributed key material, and is capable of computing a usage security key based on the distributed key material and predefined user group key material.
Claims30
A key management method wherein a number of user subgroups is selected, from a plurality Gm of user groups each supporting an instance of a key distribution method M for receiving distributed key material, and wherein each subgroup is capable of computing a usage security key based on the distributed key material and pre-defined user group key material.
Dependencies are inferred from the claim text.