Secure system firmware by disabling read access to firmware ROM

Details Secure system firmware by disabling read access to firmware ROM Secure system firmware by disabling read access to firmware ROM

2005-07-19

2005-07-19

Caldwell, Andrew (Department: 2137)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S193000, C711S163000

Reexamination Certificate

active

06920566

ABSTRACT:
Systems, methods and software that use a programmable lock bit that disables read access to a firmware ROM until the CPU is reset or enters into a secure CPU mode. The present invention provides for secure system firmware by preventing access to and reading of the contents of the firmware ROM.

REFERENCES:
patent: 4583196 (1986-04-01), Koo
patent: 5058164 (1991-10-01), Elmer et al.
patent: 5446864 (1995-08-01), Burghardt et al.
patent: 5511184 (1996-04-01), Lin
patent: 6138240 (2000-10-01), Tran et al.

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