Electrical computers and digital processing systems: support – Data processing protection using cryptography
Reexamination Certificate
2007-02-13
2007-02-13
Arani, Taghi T. (Department: 2131)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
C713S182000, C713S193000, C713S194000, C711S163000, C711S164000, C380S200000, C380S277000
Reexamination Certificate
active
09704329
ABSTRACT:
A digital interface device is provided for facilitating key encryption of a digital signal which is communicated from a computer system to an associated peripheral device, such as a digital display device. The digital interface device has a digital output, digital output formatting circuitry associated with the output and a non-volatile RAM for storing a basic input/output system (BIOS) for, inter alia, controlling digital output formatting. The interface device is configured such that the non-volatile RAM has a specific addressable write-protectable area allocated for storing an encryption key flag at a flag address along with encryption key data. The write-protectable area is rendered read-only when a predetermined flag value is stored at the flag address. Thus, encryption key data may be stored in the specific write-protectable area of the non-volatile RAM in connection with storing the predetermined flag at that flag address such that encryption data cannot be altered when the flash RAM is subsequently written to, such as when a BIOS stored in the non-volatile RAM is updated.
REFERENCES:
patent: 4388695 (1983-06-01), Heinemann
patent: 4825358 (1989-04-01), Letwin
patent: 5224166 (1993-06-01), Hartman, Jr.
patent: 5421006 (1995-05-01), Jablon et al.
patent: 5539478 (1996-07-01), Bertram et al.
patent: 5592556 (1997-01-01), Schwed
patent: 5606610 (1997-02-01), Johansson
patent: 6378072 (2002-04-01), Collins et al.
patent: 6385152 (2002-05-01), Fujinami et al.
patent: 6507904 (2003-01-01), Ellison et al.
patent: 6542160 (2003-04-01), Abgrall
patent: 6754678 (2004-06-01), Norris et al.
patent: 6845450 (2005-01-01), Kobayashi et al.
Arani Taghi T.
ATI International SRL
Volpe and Koenig P.C.
LandOfFree
Write once system and method for facilitating digital... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Write once system and method for facilitating digital..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Write once system and method for facilitating digital... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3835000