Asus Z87-WS User Manual page 120

Key Management
This item appears only when you set OS Type to [Windows UEFI Mode]. It allows you
to manage the Secure Boot keys.
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.
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Clear Secure Boot keys
This item appears only when you load the default Secure Boot keys. This
item allows you to clear all default Secure Boot keys.
Save Secure Boot Keys
Allows you to save the PK (Platform Keys) to a USB storage device.
Delete PK
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
Allows you to load the downloaded PK from a USB storage device.
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.
Secure Boot Key-Enrollment Key (KEK).
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Chapter 3: BIOS setup