METHOD FOR GENERATING REVOKED NODE LIST IN BROADCAST ENCRYPTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a method for generating a revoked node list in a broadcast encryption system in which the size of tags is small and the node IDs of revoked leaf nodes are efficiently arrayed.

SOLUTION: A method for generating a revoked node list includes recognizing ID of a parent node of at least one revoked leaf node; and generating a list of the revoked nodes by arraying the ID of the parent node and the ID of the at least one revoked leaf node sequentially. Alternatively, the method comprises recognizing ID of a first parent node that is the parent node of at least one first revoked leaf node; and generating a list in which an ID generated by arraying the ID of the first parent node and the ID of the first leaf nodes is recorded with the revoked node ID.

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