# Bitlocker Drive Encryption

`Computer Configuration\Administrative Templates\Windows Components\Bitlocker Drive Encryption`

Choose drive encryption method and cipher strength-> Enable -> XTS-AES 256-bit for operating system, fixed data, and removable drives.

**The disable new DMA devices when computer is locked should only be enabled if the specific computer does not support kernel DMA protection.**

## Operating System Drives

- Require additional authentication at startup -> Enabled -> Do not allow TPM, Allow startup PIN with TPM, Do not allow startup key with TPM, Allow startup key and PIN with TPM. (**This is especially important as we do not want the TPM to automatically release the encryption key at boot.**)
- Allow enhanced PINs for startup -> Enabled.
- Configure TPM platform validation profile for native UEFI firmware configurations -> Enabled -> PCR 0,1,2,3,3,4,5,6,7,11