Method and apparatus for protecting flash memory

Details Method and apparatus for protecting flash memory Method and apparatus for protecting flash memory

1996-06-28

1998-07-07

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 23, H04L 900, H04K 100

Patent

active

057780706

ABSTRACT:
In a computer system having a processor, a system memory, a flash memory, and a memory controller, a method comprising the steps of loading a flash memory upgrade program containing a new flash memory image and a digital signature into a portion of the system memory; configuring the memory controller to limit the processor to accessing only the flash memory and the portion of the system memory; verifying the flash memory update program using the digital signature; and, updating the flash memory only if the flash memory upgrade program is authentic.

REFERENCES:
patent: 5022077 (1991-06-01), Bealkowski et al.
patent: 5412717 (1995-05-01), Fischer
patent: 5421006 (1995-05-01), Jablon et al.
patent: 5442704 (1995-08-01), Holtey
patent: 5465299 (1995-11-01), Matsumoto et al.

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