Information recording/reproducing device and information...

Details Information recording/reproducing device and information... Information recording/reproducing device and information...

2008-01-04

2011-12-06

Cervetti, David García (Department: 2436)

Cryptography

Video cryptography

C380S201000, C380S202000, C380S203000, C380S204000

Reexamination Certificate

active

08073142

ABSTRACT:
Embodiments protect user data in its entirety from unauthorized access when an authorized user does not access a medium for a predetermined length of time by making encryption key data used to encrypt the user data unavailable. In one embodiment, using a magnetic disk in which a data losing time of an encryption key data recording area is shorter than a user data recording area, recording is performed to the magnetic disk while encrypting user data during recording, and encryption key data for use with encryption is recorded in the encryption data recording area. For reproduction of the user data, the encryption key data is read from the encryption key data recording area, and the user data encrypted during the recording is output while being decrypted using an encryption key generated by the encryption key data, and the encryption key data is overwritten on the encryption key data recording area.

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patent: 6938162 (2005-08-01), Nagai et al.
patent: 7028908 (2006-04-01), Kuroda et al.
patent: 2004/0215909 (2004-10-01), Imai et al.
patent: 2004-014079 (2004-01-01), None
patent: 2004-296031 (2004-10-01), None
patent: 2004-362278 (2004-12-01), None

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