Chapter 4: UEFI BIOS
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Authorized TimeStamps (dbt)
This feature allows the user to set and save the timestamps for the authorized signa-
tures which will indicate the time when these signatures are entered into the system.
Select Update to update your "Authorized TimeStamps". Select Append to append your
"Authorized TimeStamps". The settings are Update, and Append.
OsRecovery Signature (dbr)
This item uploads and installs an OSRecovery Signature. Use this feature to export
NVRAM content of secure boot variables to les in a root folder on a le system device.
The le formats accepted are:
1) Public Key Certicate
a. EFI Signature List
b. EFI CERT X509 (DER Encoded)
c. EFI CERT RSA2048 (bin)
d. EFI SERT SHA256 (bin)
2) Authenticated UEFI Variable
3) EFI PE/COFF Image (SHA256)
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