Patent ID: 8189793

Claim:
A key terminal apparatus, comprising: a crypto-processing Large Scale Integrated circuit (LSI) operable to perform predetermined crypto-processing, unique information identifying the crypto-processing LSI being embedded in the crypto-processing LSI; a manufacturer key storage unit provided external of the crypto-processing LSI, the manufacturer key storage unit storing an encrypted manufacturer key, the encrypted manufacturer key being generated by encrypting a manufacturer key unique to a manufacturer of the key terminal apparatus using a predetermined key; an interface unit connected to a device key encryption server, the device key encryption server generating an encrypted device key by encrypting a predetermined device key using a predetermined unique manufacturer key, the predetermined unique manufacturer key being generated based on the unique information and the manufacturer key; and a control unit operable to transmit the unique information to the device key encryption server, and to receive the encrypted device key corresponding to the unique information from the device key encryption server, wherein a predetermined master key corresponding to the predetermined key is embedded in the crypto-processing LSI, wherein the crypto-processing LSI (a) receives the encrypted manufacturer key from the manufacturer key storage unit, (b) decrypts the encrypted manufacturer key using the predetermined master key to generate a manufacturer key, (c) generates a unique manufacturer key identical to the predetermined unique manufacturer key, based on the unique information embedded in the crypto-processing LSI and the generated manufacturer key, and (d) decrypts the received encrypted device key using the generated identical unique manufacturer key to generate the predetermined device key.