Detection of secure variable alteration in a computing device equipped with unified extensible firmware interface (UEFI)-compliant firmware
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United States of America Patent
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Jan 16, 2018
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N/A
app pub date -
Apr 4, 2014
filing date -
Apr 8, 2013
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Abstract
A firmware-based mechanism for protecting against physical attacks on ROM areas holding Authenticated Variables. A first hash of contents of at least one Authenticated Variable is created by a computing device's UEFI-compliant firmware and stored in a non-volatile storage location. Subsequently a second hash of contents of the at least one Authenticated Variable is created by the firmware and compared by the firmware to the stored hash to identify unauthorized modifications of the at least one Authenticated Variable occurring after the creation of the first hash.
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