Controller, control method, computer program, recording medium for computer program, recording apparatus, and manufacturing method for recording apparatus

A control method used by a controller for embedding in a recording medium apparatus and controlling memory access, including:

• a unique key generation step of generating a unique key assigned to the controller;
• a decryption step of (i) acquiring encrypted key information, the encrypted key information being generated by encrypting a private key for the recording medium apparatus with the unique key, and (ii) decrypting the encrypted key information so acquired with the unique key to generate decrypted information;
• a private key verification step of verifying whether or not the decrypted information generated in the decryption step is the private key;
• and
• an encrypted key information write step of writing the encrypted key information so acquired to memory when the decrypted information is verified to be the private key.

A computer program intended to control a controller for embedding in a recording medium apparatus and controlling memory access, the computer program causing the controller, which is a computer, to execute:

• a unique key generation step of generating a unique key assigned to the controller;
• a decryption step of (i) acquiring encrypted key information, the encrypted key information being generated by encrypting a private key for the recording medium apparatus with the unique key, and (ii) decrypting the encrypted key information so acquired with the unique key to generate decrypted information;
• a private key verification step of verifying whether or not the decrypted information generated in the decryption step is the private key;
• and
• an encrypted key information write step of writing the encrypted key information so acquired to memory when the decrypted information is verified to be the private key.

A computer-readable recording medium on which is recorded a computer program intended to control a controller for embedding in a recording medium apparatus and controlling memory access, the computer program causing the controller, which is a computer, to execute:

• a unique key generation step of generating a unique key assigned to the controller;
• a decryption step of (i) acquiring encrypted key information, the encrypted key information being generated by encrypting a private key for the recording medium apparatus with the unique key, and (ii) decrypting the encrypted key information so acquired with the unique key to generate decrypted information;
• a private key verification step of verifying whether or not the decrypted information generated in the decryption step is the private key;
• and
• an encrypted key information write step of writing the encrypted key information so acquired to memory when the decrypted information is verified to be the private key.

A recording apparatus including memory and a controller controlling memory access, the controller comprising:

• a unique key generation unit operable to generate a unique key assigned to the controller;
• a decryption unit operable to (i) acquire encrypted key information, the encrypted key information being generated by encrypting a private key for the recording medium apparatus with the unique key, and (ii) decrypt the encrypted key information so acquired with the unique key to generate decrypted information;
• a private key verification unit operable to verify whether or not the decrypted information generated by the decryption unit is the private key;
• and
• an encrypted key information write unit operable to write the encrypted key information so acquired to memory when the decrypted information is verified to be the private key.

A manufacturing method for a recording apparatus including memory and a controller controlling memory access, comprising:

• the steps, performed by a controller manufacturer, of manufacturing the controller with a controller key embedded therein, adding a controller-specific number unique to the controller after manufacturing, registering the controller key and the controller-specific number with a key issuing authority, and providing the controller to a media assembler;
• the step, performed by the key issuing authority, of issuing encrypted key information to the media assembler upon generating a unique key from the controller key and the controller-specific number received from the controller manufacturer and encrypting a private key for the recording apparatus using the unique key;
• the steps, performed by the media assembler, of assembling the recording apparatus from the controller received from the controller manufacturer and the memory, and supplying the encrypted key information received from the key issuing authority to the recording apparatus;
• and
• the steps, performed by the recording apparatus, of receiving the encrypted key information, decrypting the encrypted key information using the unique key generated from the controller key and the controller-specific number to obtain decrypted information, verifying whether the decrypted information so obtained is the private key for the recording apparatus, and writing the encrypted key information to memory when verification succeeds.