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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).
Delete KEK
Allows you to delete the KEK from your system. Once the KEK is deleted, the db
and the dbx cannot be updated in the operating system.
Load Default KEK
Select Yes to load the system default KEK or select No to load a downloaded KEK
from a USB storage device.
Append Default KEK
Select Yes to append the system default KEK or select No to append a downloaded
additional KEK from a USB storage device for the db and dbx management.
The KEK le 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.
Delete the db
Allows you to delete the db le from your system. Doing so may cause boot failures.
Load Default db
Select Yes to load the system default db or select No to load a downloaded db from
a USB storage device.
Append Default db
Select Yes to append the system default db or select No to append a downloaded
additional db from a USB storage device to load certain customized UEFI
executable les.
• The DB le must be formatted as a UEFI variable structure with time‑based
authenticated variable.
• UEFI executable les include UEFI boot devices, drivers and applications.
dbx Management
The dbx (Revoked Signature database) lists the forbidden images of db items that are
no longer trusted and cannot be loaded.
Delete the dbx
Allows you to delete the DBX le from your system. Doing so may expose the
system to security threats.
Load Default dbx
Select Yes to load the system default dbx or select No to load a downloaded dbx
from a USB storage device.
2-46 Chapter 2: Getting started