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METHOD FOR CONSTRUCTING KEY TREE FOR HIERARCHICAL ACCESS CONTROL IN BROADCASTING AND COMMUNICATION SYSTEM, AND METHOD OF KEY MANAGEMENT USING IT
METHOD FOR CONSTRUCTING KEY TREE FOR HIERARCHICAL ACCESS CONTROL IN BROADCASTING AND COMMUNICATION SYSTEM, AND METHOD OF KEY MANAGEMENT USING IT
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机译:广播和通信系统中用于分层访问控制的关键树的构建方法以及使用它的密钥管理方法
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摘要
A key tree constructing method for controlling a hierarchical access in a broadcasting and communication system and a key management method using the same are provided to reduce a storage overhead and a communication overhead generated in a dynamic management in a capacity of a user. A key tree constructing method for controlling a hierarchical access in a broadcasting and communication system comprises the following several steps. A key tree whose root key is a user group key allocated to a corresponding group for each user group is constructed by using a hierarchical access relationship between the user group and a resource. A connected network is constructed by connecting a corresponding session key for each resource to the user group key allocated to the user group affiliated to a corresponding resource on the basis of the hierarchical access relationship. A hierarchical access control key tree is constructed by connecting the key tree for each user group to the user group key on the connected network.
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