Table 31. TPM 2.0 security information
Option
Description
TPM Information
Changes the operational state of the TPM. This option is set to
No Change
by default.
TPM Firmware
Indicates the firmware version of the TPM.
TPM Hierarcy
Enables, disables, or clears the storage and endorsement hierarchies. When set to
Enabled
, the storage and
endorsement hierarchies can be used.
When set to
Disabled
, the storage and endorsement hierarchies cannot be used.
When set to
Clear
, the storage and endorsement hierarchies are cleared of any values, and then reset to
Enabled
.
Table 32. System Security details
Option
Description
Power Button
Enables or disables the power button on the front of the system. This option is set to
Enabled
by default.
AC Power Recovery
Sets how the system behaves after AC power is restored to the system. This option is set to
Last
by default.
AC Power Recovery Delay
Sets the time delay for the system to power up after AC power is restored to the system. This
option is set to
Immediate
by default.
User Defined Delay (60 s to 600 s)
Sets the
User Defined Delay
option when the
User Defined
option for
AC Power Recovery
Delay
is selected.
UEFI Variable Access
Provides varying degrees of securing UEFI variables. When set to
Standard
(the default), UEFI
variables are accessible in the operating system per the UEFI specification. When set to
Controlled
, selected UEFI variables are protected in the environment and new UEFI boot
entries are forced to be at the end of the current boot order.
Secure Boot
Enables Secure Boot, where the BIOS authenticates each pre-boot image by using the
certificates in the Secure Boot Policy. Secure Boot is set to
Disabled
by default.
Secure Boot Policy
When Secure Boot policy is set to
Standard
, the BIOS uses the system manufacturer’s key
and certificates to authenticate pre-boot images. When Secure Boot policy is set to
Custom
,
the BIOS uses the user-defined key and certificates. Secure Boot policy is set to
Standard
by
default.
Secure Boot Mode
Configures how the BIOS uses the Secure Boot Policy Objects (PK, KEK, db, dbx).
If the current mode is set to
Deployed Mode
, the available options are
User Mode
and
Deployed Mode
. If the current mode is set to
User Mode
, the available options are
User
Mode
,
Audit Mode
, and
Deployed Mode
.
Table 33. Secure Boot Mode
Options
Descriptions
User Mode
In
User Mode
, PK must be installed, and BIOS performs signature
verification on programmatic attempts to update policy objects.
The BIOS allows unauthenticated programmatic transitions between modes.
Deployed
Mode
Deployed Mode
is the most secure mode. In
Deployed Mode
, PK must be
installed and the BIOS performs signature verification on programmatic
attempts to update policy objects.
Deployed Mode
restricts the programmatic mode transitions.
Audit Mode
In
Audit mode
, PK is not present. The BIOS does not authenticate
programmatic updates to the policy objects, and transitions between modes.
The BIOS performs a signature verification on pre-boot images and logs the
results in the image Execution Information Table, but executes the images
whether they pass or fail verification.
34
Pre-operating system management applications
