METHOD FOR VALIDATING EXPANSION ROMS USING CRYPTOGRAPHY
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United States of America Patent
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N/A
Issued Date -
Jul 5, 2001
app pub date -
Sep 11, 1997
filing date -
Sep 11, 1997
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for validating expansion ROM cards which are loaded into a Personal Computer. A ROM image is signed (encrypted) using a private key and an encryption algorithm to create a digital signature. The digital signature is stored along with the ROM image on an expansion ROM. The system BIOS scans the system for the presence of an expansion ROM and when one is detected, the digital signature is verified (decrypted) using a public key corresponding to the private key. If the decrypted digital signature matches the ROM image (or a hash digest thereof), then the BIOS loads the ROM image.
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