To prevent information leakage of data.
A storage device has: a first area storing encrypted data; a second area including a first encrypted authentication key for managing the first area; and a state management unit for managing each of the first and second areas in either an accessible state or an inaccessible state. A control device has: a decryption unit for decrypting the first encrypted authentication key; a second authentication key for making the second area accessible; and an encryption control unit for controlling a state of the state management unit. For performing authentication processing in the storage device, the encryption control unit uses the second authentication key to change the inaccessible state of the second area to the accessible state, reads out the first authentication key from the second area to decrypt the first authentication key, then changes the inaccessible state of the first area to the accessible state by using the first authentication key. Also, for performing content change of the first authentication key, the encryption control unit can change contents of the first authentication key.
SUENAGA MASAYA
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土屋 徹雄
大貫 敏史
江口 昭彦
稲葉 良幸
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