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Latitude 5591 Setup and Specifications Guide

Secure Boot screen options

Secure Boot Enable
This option enables or disables the Secure Boot feature.
  • Disabled
  • Enabled

Default setting: Enabled.

Secure Boot Mode
Allows you to change to Secure Boot operation mode, modifies the behavior of the Secure Boot to allow evaluation or enforcement of UEFI driver signatures. The options are:
  • Deployed Mode—Before allowing execution, checks the integrity of UEFI drivers and bootloaders.
  • Audit Mode—Performs a signature check but does not block execution of all UEFI drivers and bootloaders.

Default setting: Deployed Mode

Expert Key Management
Allows you to manipulate the security key databases only if the system is in Custom Mode. The Enable Custom Mode option is disabled by default. The options are:
  • PK
  • KEK
  • db
  • dbx
If you enable the Custom Mode, the relevant options for PK, KEK, db, and dbx appear. The options are:
  • Save to File—Saves the key to a user-selected file
  • Replace from File—Replaces the current key with a key from a user-selected file
  • Append from File—Adds a key to the current database from a user-selected file
  • Delete—Deletes the selected key
  • Reset All Keys—Resets to default setting
  • Delete All Keys—Deletes all the keys
NOTE: If you disable the Custom Mode, all the changes that are made are erased and the keys restore to default settings.

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