Key management method using hierarchical node topology, and method of registering and deregistering user using the same

摘要

A key management, user registration and deregistration for a digital rights management (DRM) system in a home network, using a hierarchical node topology. In the key management, node information is generated by allocating a pair of keys (a public key and a private key) to each node. A node tree is made by generating link information using the pair of keys and a content key. The link information is delivered from an upper node to a lower node using the node tree. The link information is obtained by encrypting a private key of a ‘TO’ node using a public key of a ‘FROM’ node. Accordingly, it is possible to realize a DRM system that protects content and easily accomplishes a binding mechanism and a revocation mechanism.

主权项

1. A key management method using a hierarchical node topology in a home network including a home server, a transmitting node and a receiving node, the key management method comprising:
creating node information by allocating to each node of the transmitting node and the receiving node a public key and a private key; generating by the home server, link information using the public key and the private key of each node of the transmitting node and the receiving node; and delivering a content key from an upper node to a lower node, wherein the link information is obtained by the home server by encrypting a private key of the receiving node with a public key of the transmitting node.