| 摘要 |
The present invention relates to a method and a system to distribute content under the content access control of a user terminal and, more specifically, to a method and a system to distribute content under the content access control of a user terminal. The method comprises the steps of: allowing a key creating server to create a generator and any element belonging to a bilinear group, and to apply the created generator and element to a bilinear function to create a public parameter; allowing the key creating server to receive a set of access structures accessing content from a user terminal, and create an access rights secret key indicating whether it is possible to access the content, based on the set of access structures; allowing a content providing server to receive the public parameter from the key creating server, to encode the content, based on the received public parameter to create content cyphertext, and to transmit the created content cyphertext to the user terminal; and allowing the user terminal to receive the access rights secret key from the key creating server and decode the content cyphertext received from the content providing server, based on the received access rights secret key to access the content. By the above configuration, the method and the system to distribute content under the content access control of a user terminal can allow the user terminal to receive the content or whether it is possible to access the content more efficiently by encoding the access rights secret key indicating whether it is possible to access the content together with the content. |
