Asus Z170M-PLUS User Manual page 80

Install Default Secure Boot keys
This item allows you to immediately load the default Security Boot keys, Platform key
(PK), Key‑exchange Key (KEK), Signature database (db), and Revoked Signatures
(dbx). When the default Secure boot keys are loaded, all the Secure Boot keys' state
will change from Unloaded mode to loaded mode.
Clear Secure Boot keys
This item appears only when you load the default Secure Boot keys. This item allows
you to clear all the previously applied Secure Boot keys.
Save Secure Boot Keys
This item allows you to save all the Secure Boot keys to a USB storage device.
PK Management
The Platform Key (PK) locks and secures the firmware from any non‑permissible
changes. The system verifies the PK before your system enters the OS.
Set New Key
This item allows you to load the downloaded PK from a USB storage device.
The PK file must be formatted as a UEFI variable structure with time‑based authenticated
variable.
Delete Key
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]
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
Set New Key
Allows you to load the downloaded KEK from a USB storage device.
Append Key
Allows you to load the additional KEK from a storage device for an additional db and
dbx loaded management.
Delete Key
Allows you to delete the KEK from your system. Configuration options: [Yes] [No]
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.
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Secure Boot Key‑Enrollment Key (KEK).
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Chapter 2: Getting started