Patent ID: 8745391

Claim:
An information recording device, comprising: a data storage device configured to store: an encrypted medium device key generated by encrypting a medium device key, which functions as a secret key of a public key cryptosystem, using a controller unique key, and a medium device key certificate, which functions as a public key of the public key cryptosystem; and a controller, including: an information recording unit configured to store a controller key and first controller identification information unique to the controller; a key generation unit configured to execute a first one-way function calculation based on the controller key and the first controller identification information to generate the controller unique key, which is unique to the controller; an identification information unit configured to execute a second one-way function calculation based on the controller key and the first controller identification information to generate second controller identification information; a key encryption unit configured to encrypt the medium device key by using the controller unique key to generate the encrypted medium device key; and a key exchange unit configured to execute an authentication key exchange process with a host device using the medium device key and the medium device key certificate.