Patent ID: 8239691

Claim:
A hard disk drive data storage device comprising: an enclosure; a spindle motor fixedly coupled within said enclosure; at least one magnetic disk fixedly coupled with said spindle motor, said at least one magnetic disk being a medium for storing encrypted data; a key cryptographic processor for generating a key cryptographic key using external key generation data received from a host and internal key generation data stored inside the data storage device, and decrypting a data cryptographic key stored inside the data storage device in encrypted a data cryptographic key using the key cryptographic key; a data cryptographic processor for performing a cryptographic operation on data in the medium using decrypted said the data cryptographic key; and an authentication processor for performing authentication using the external key generation data as a password, wherein the key cryptographic processor generates the key cryptographic key using the password used in the authentication if the authentication has been normally performed, wherein if the password is changed, the key cryptographic processor generates the key cryptographic key with changed the password and renewed the internal key generation data, and encrypts the data cryptographic key using generated said the key cryptographic key.