Method for Software Anti-Rollback Recovery
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United States of America Patent
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N/A
Issued Date -
Sep 4, 2014
app pub date -
Mar 1, 2013
filing date -
Mar 1, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A temporary anti-rollback table—which is cryptographically signed, unique to a specific device, and includes a version number—is provided to an electronic device requiring a replacement anti-rollback table. The table is verified by the device, and loaded to memory following a reboot. The memory image of the table is used to perform anti-rollback verification of all trusted software components as they are loaded. After booting, the memory image of the table is written in a secure manner to non-volatile memory as a replacement anti-rollback table, and the temporary anti-rollback table is deleted. The minimum required table version number in OTP memory is incremented. The temporary anti-rollback table is created and signed using a private key at authorized service centers; a corresponding public key in the electronic device verifies its authenticity.
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