Terminal device, information storage medium, and data...

Details Terminal device, information storage medium, and data... Terminal device, information storage medium, and data...

2005-07-07

2009-08-04

Cervetti, David Garcia (Department: 2436)

Information security

Prevention of unauthorized use of data including prevention...

C713S166000, C713S164000

Reexamination Certificate

active

07571487

ABSTRACT:
A portable telephone is configured to include a storage section which includes a protected area and a user area, an encryption processing section which encrypts arbitrary data to generate encrypted data, a separation processing section which divides the encrypted data at an arbitrary position, stores first divided data which is a piece of the divided data and division position information indicating the division position in the protected area, and stores second divided data which is the remaining piece of the divided data in the user area, a recovery processing section which recovers the encrypted data based on the first and second divided data and the division position information when a use request for the arbitrary data has been issued, and a decryption processing section which decrypts the recovered encrypted data.

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