Patent ID: 7739495

Claim:
A storage apparatus for storing information retrieved by an information processing apparatus, the storage apparatus comprising: a first storage section that stores data for access by the information processing apparatus; and a security module distinct from the first storage section, the security module comprising: a second storage section that stores a first revoked unit list; a mutual authentication section that executes a mutual authentication protocol with the information processing apparatus; a receiving section that receives a second revoked unit list from the information processing apparatus; and a judging section that judges whether the information processing apparatus is revoked or not based on the first revoked unit list; wherein if the information processing apparatus is revoked, the first revoked unit list is maintained in the second storage section of the security module, and if the information processing apparatus is not revoked, the first revoked unit list is replaced with the second revoked unit list in the second storage section of the security module, and wherein the security module prevents the information processing apparatus from accessing the data stored by the first storage section when the mutual authentication protocol does not authenticate the information processing apparatus.