Secure updating of non-volatile memory

Details Secure updating of non-volatile memory Secure updating of non-volatile memory

1997-11-19

2000-07-04

Nguyen, Hiep T.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711104, 711156, 711166, 713200, G06F 1216

Patent

active

060852992

ABSTRACT:
A secure start-up system for a computer enables a flash memory to be reset in a secured way. Various operations are carried out to make sure that the reset is an authorized one, and to avoid unauthorized, e.g. virus, infiltration. These operations include multiple tests to avoid the probability of the reset being unauthorized. Any one or more than one of the following can be used. Flashing is only authorized when a special flash enable bit is set in the non-volatile memory. This flash enable bit is reset during every startup cycle. Flashing is only authorized from a cold boot as opposed from a warm boot. This minimizes the possibility of a computer routine authorizing flashing by a software reset. Flashing is only authorized from a floppy. This prevents a virus from writing the flashing routine to the boot sector of a non-removable disc. The user is warned prior to flashing, and asked to confirm. Finally, contents of the flashing routine can be checked using some kind of checking algorithm such as a secure hash algorithm.

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