Electrical computers and digital processing systems: support – Computer program modification detection by cryptography
Reexamination Certificate
2006-06-27
2006-06-27
Vu, Kim (Department: 2135)
Electrical computers and digital processing systems: support
Computer program modification detection by cryptography
C713S189000, C726S022000, C726S024000, C711S163000, C711S165000
Reexamination Certificate
active
07069445
ABSTRACT:
A computer system (e.g., a personal computer (PC)) is loaded with multiple versions of the bootable program (e.g., an operating system (OS)). The boot record for each bootable program version is hashed to produce a digest and the digest is signed using the cryptographic signature engine using the program's private installation key. The resulting signature, along with data indicating the program's name and version, is stored in fields of the non-volatile memory. When the system boots with a version of the program, the active entry is decrypted and the resulting data is compared. If a new version is being booted, then it is determined if the new version is the alternative entry. If so, the active entry is discarded and the alternative version is moved to be the active entry and the system boots with the new version of the program.
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Cheston Richard Wayne
Dayan Richard Alan
Lenovo (Singapore) Pte. Ltd
Pich Ponnoreay
Reid Scott W.
Vu Kim
Winstead Sechrest & Minick P.C.
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