Dell XPS 13 9315 Service Manual page 47

Table 10. System setup options—Security menu (continued)
Security
SHA-256
Clear
TPM State
Intel Platform Trust Technology (PTT)
PTT On
Physical Presence Interface (PPI) Bypass
for Clear Commands
Clear
Chassis intrusion
Chassis Intrusion Detection
By default, the Key Storage Enable option is enabled.
For additional security, Dell Technologies recommends keeping the Key Storage
Enable option enabled.
NOTE: When disabled, this feature may cause compatibility issues or loss of
functionality in some operating systems.
Allows you control the usage of SHA-256 by TPM. When enabled, the BIOS and
TPM use the SHA-256 hash algorithm to extend measurements into the TPM
PCRs during BIOS boot. When disabled, the BIOS and TPM use the SHA-1 hash
algorithm to extend measurements into the TPM PCRs during BIOS boot.
By default, the SHA-256 option is enabled.
For additional security, Dell Technologies recommends keeping the SHA-256
option enabled.
When enabled, the Clear option clears information stored in the TPM after
exiting the system's BIOS. This option returns to disabled state when the system
restarts.
By default, the Clear option is disabled.
Dell Technologies recommends enabling the Clear option only when TPM data is
required to be cleared.
Enables or disables the Trusted Platform Module (TPM). This is the normal
operating state for the Trusted Platform Module (TPM) when you want to use its
complete array of capabilities.
By default, the TPM State option is enabled.
Intel PTT is a firmware-based Trusted Platform Module (fTPM) device that is
part of Intel chipsets. It provides credential storage and key management that
can replace the equivalent functionality of a discrete TPM chip.
Enables or disables the Intel PTT option.
By default, the PTT On option is enabled.
For additional security, Dell Technologies recommends keeping the PTT On
option enabled.
The PPI Bypass for Clear Commands option allows the operating system to
manage certain aspects of PTT. When enabled, you are not prompted to confirm
changes to the PTT configuration.
By default, the PPI Bypass for Clear Commands option is disabled.
For additional security, Dell Technologies recommends keeping the PPI Bypass
for Clear Commands option disabled.
When enabled, the Clear option clears the information stored in the PTT fTPM
after exiting the system's BIOS. This option returns to disabled state when the
system restarts.
By default, the Clear option is disabled.
Dell Technologies recommends enabling the Clear option only when PTT fTPM
data needs to be cleared.
Allows you to control the chassis intrusion feature. This feature notifies the user
when the base cover has been removed from the computer.
When set to Enabled, a notification is displayed on the next boot and the event
is logged in the BIOS Events log.
System setup 47