KEY TREE MANAGEMENT SCHEME AND KEY DISTRIBUTION METHOD FOR HIERARCHICAL ACCESS CONTROL

摘要

PURPOSE: A key tree configuration and key distribution method for hierarchial role base access control is provided to provide data stream to a user safely and efficiently under the internet environment, by using a key table management method. CONSTITUTION: A key tree including relation between data and hierarchial structure of each role group is generated. Encoding and decoding for a data key and a role key are performed. A key table including the data key and the role key is generated. The data key is used in a decoding process of coded data by referring to the key tree. The role key is used in decoding the coded data key. The data key is acquired by using the generated key tree and the key table.