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Zych, A.K. and Doumen, J.M. and Jonker, W. and Hartel, P.H. and Petkovic, M. (2008) Method of Key Management. Patent WO2008026184 (Assigned).
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The invention relates to a method of key management for group-based controlled access to encrypted data, in which a decryption key for the encrypted data can be obtained by a party if the party is a member of at least one group which is authorized to access the data, the groups being organized in a hierarchical tree in which each non-leaf node represents a group and each leaf node represents a member of all groups represented by nodes hierarchically superior to the leaf node in question.
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