Asus Z170 PRO GAMING, User Manual, Page: 84 / 100

The PK file must be formatted as a public key certificate or 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 ® Secure Boot Key‑Enrollment Key (KEK).
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.
The KEK file must be formatted as a public key certificate or UEFI variable structure with
time‑based authenticated variable.
Delete key
Allows you to delete the Key from your system. Configuration options: [Yes] [No]
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.
Set New Key
Allows you to load the downloaded db 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.
The KEK file must be formatted as a public key certificate or UEFI variable structure with
time‑based authenticated variable.
Delete key
Allows you to delete the Key from your system. Configuration options: [Yes] [No]
DBX Management
The DBX (Revoked Signature database) lists the forbidden images of db items that are
no longer trusted and cannot be loaded.
Set New Key
Allows you to load the downloaded dbx 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.
The KEK file must be formatted as a public key certificate or UEFI variable structure with
time‑based authenticated variable.
Delete key
Allows you to delete the Key from your system. Configuration options: [Yes] [No]
2-44 Chapter 2: BIOS information