Asus Z87-DELUXE User Manual page 122

KEK Management
The KEK (Key-exchange Key or Key Enrollment Key) manages the Signature database
(db) and Revoked Signature database (dbx).
Key-exchange Key (KEK) refers to Microsoft
The KEK file must be formatted as a UEFI variable structure with time-based authenticated
variable.
DB Management
The db (Authorized Signature database) lists the signers or images of UEFI
applications, operating system loaders, and UEFI drivers that you can load on the
single computer.
The db file must be formatted as a UEFI variable structure with time-based authenticated
variable.
DBX Management
The dbx (Revoked Signature database) lists the forbidden images of db items that are
no longer trusted and cannot be loaded.
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Delete the KEK
Allows you to delete the KEK from your system.
Configuration options: [Yes] [No]
Load KEK from File
Allows you to load the downloaded KEK from a USB storage device.
Append KEK from File
Allows you to load the additional KEK from a storage device for an
additional db and dbx loaded management.
Delete the db
Allows you to delete the db file from your system.
Configuration options: [Yes] [No]
Load db from File
Allows you to load the downloaded db from a USB storage device.
Append db from File
Allows you to load the additional db from a storage device so that more
images can be loaded securely.
Delete the dbx
Allows you to delete the dbx file from your system.
Load dbx from File
Allows you to load the downloaded dbx from a USB storage device.
Configuration options: [Yes] [No]
Secure Boot Key-Enrollment Key (KEK).
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Chapter 3: BIOS setup