Asus Z97-A/USB 3.1 User Manual page 108

PK Management
The Platform Key (PK) locks and secures the firmware from any permissible changes.
The system verifies the PK before your system enters the OS.
The PK file must be formatted as a UEFI variable structure with time-based authenticated
variable.
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.
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Delete PK
This item allows you to delete the PK from your system. Once the PK is
deleted, all the system's Secure Boot keys will not be active.
Configuration options: [Yes] [No]
Load PK from File
This item allows you to load the downloaded PK from a USB storage
device.
Delete the KEK
This item allows you to delete the KEK from your system.
Configuration options: [Yes] [No]
Load KEK from File
This item allows you to load the downloaded KEK from a USB storage
device.
Append KEK from File
This item allows you to load the additional KEK from a storage device for
an additional db and dbx loaded management.
Delete the db
This item allows you to delete the db file from your system.
Configuration options: [Yes] [No]
Load db from File
This item allows you to load the downloaded db from a USB storage
device.
Append db from File
This item allows you to load the additional db from a storage device so that
more images can be loaded securely.
Secure Boot Key-Enrollment Key (KEK).
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Chapter 2: BIOS information