METHOD OF MANAGING USER KEY FOR BROADCAST ENCRYPTION

摘要

PROBLEM TO BE SOLVED: To provide a method of managing a user key for a broadcast encryption which uses a straight line structure to construct a one-way key chain in sequence for each node and distribute key values.SOLUTION: The key management method includes assigning a node path ID to each of nodes arranged in sequence; assigning an arbitrary seed value key to each of the nodes according to the node path ID; generating key values by repeatedly applying a hash function to the assigned arbitrary seed value key; and assigning the generated key values to each of the nodes in sequence.