| 摘要 |
A method for efficiently distributing keys for digital content distribution is provided to transfer an encryption right key, a domain key, and a message affirmation key by using a symmetrical key mode requiring less computation, and enable an RI(Right Issuer) device to safely transfer a master key used for key transmission by including the master key to a registration response message transferred to a customer terminal. A customer terminal sends a hello message including a terminal ID to the RI device. The RI device sends a hello message including an RI ID, and a random number and a session ID of the RI device in response to the hello message received from the customer terminal. The customer terminal sends a message and a signature for requesting registration to the RI device. The registration request of the customer terminal includes the session ID, and the random number, request time information, and the signature of the customer terminal. If the RI device confirms validity of a public key authentication of the customer terminal, the RI device transmits a registration response message including the master key encrypted by the public key of the customer terminal, the session ID, a URL(Uniform Resource Locator) of the RI device, and the signature for the registration request message.
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