Table 32. System setup options—Security menu(continued)
Security
By default, the Attestation Enable option is enabled.
For additional security, Dell Technologies recommends keeping the Attestation
Enable option enabled.
NOTE: When disabled, this feature may cause compatibility issues or loss of
functionality in some operating systems.
Key Storage Enable The Key Storage Enable option controls the storage hierarchy of TPM, which is
used to store digital keys. Disabling the Key Storage Enable option restricts the
ability of TPM to store owner's data.
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.
SHA-256 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.
Clear 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.
TPM State 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 Platform Trust Technology (PTT) 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.
PTT On 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.
Physical Presence Interface (PPI) Bypass
for Clear Commands
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.
Clear 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.
BIOS Setup 117
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