Patent ID: 7215771

Claim:
A secure disk drive comprising: (a) a disk for storing data; (b) an input for receiving an encrypted message from a client disk drive, the encrypted message comprising ciphertext data and a client drive ID identifying the client disk drive; (c) a secure drive key; (d) an internal drive ID; (e) a key generator for generating a client drive key based on the client drive ID and the secure drive key, and an internal drive key based on the internal drive ID and the secure drive key; (f) an authenticator for verifying the authenticity of the encrypted message and generating an enable signal, the authenticator responsive to the encrypted message and the client drive key; (g) a data processor comprising: a message input for receiving the encrypted message from the client disk drive; a data output for outputting the ciphertext data to be written to the disk; an enable input for receiving the enable signal for enabling the data processor; a key input for receiving the internal drive key, the internal drive key for use in generating a message authentication code; and a reply output for outputting reply data, the reply data comprising the message authentication code; and (h) an output for outputting a reply to the client disk drive, the reply comprising the reply data and the internal drive ID.