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Merge pull request #4889 from MicrosoftDocs/repo_sync_working_branch

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Confirm merge from repo_sync_working_branch to master to sync with https://github.com/MicrosoftDocs/windows-itpro-docs (branch public)
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Tina Burden 2021-03-11 12:00:10 -08:00 committed by GitHub
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windows/security/information-protection/bitlocker/bitlocker-upgrading-faq.md
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@ -32,14 +32,17 @@ Yes.
**Suspend** keeps the data encrypted but encrypts the BitLocker volume master key with a clear key. The clear key is a cryptographic key stored unencrypted and unprotected on the disk drive. By storing this key unencrypted, the **Suspend** option allows for changes or upgrades to the computer without the time and cost of decrypting and re-encrypting the entire drive. After the changes are made and BitLocker is again enabled, BitLocker will reseal the encryption key to the new values of the measured components that changed as a part of the upgrade, the volume master key is changed, the protectors are updated to match and the clear key is erased. **Suspend** keeps the data encrypted but encrypts the BitLocker volume master key with a clear key. The clear key is a cryptographic key stored unencrypted and unprotected on the disk drive. By storing this key unencrypted, the **Suspend** option allows for changes or upgrades to the computer without the time and cost of decrypting and re-encrypting the entire drive. After the changes are made and BitLocker is again enabled, BitLocker will reseal the encryption key to the new values of the measured components that changed as a part of the upgrade, the volume master key is changed, the protectors are updated to match and the clear key is erased.
## Do I have to decrypt my BitLocker-protected drive to download and install system updates and upgrades? ## Do I have to suspend BitLocker protection to download and install system updates and upgrades?
No user action is required for BitLocker in order to apply updates from Microsoft, including [Windows quality updates and feature updates](https://technet.microsoft.com/itpro/windows/manage/waas-quick-start). No user action is required for BitLocker in order to apply updates from Microsoft, including [Windows quality updates and feature updates](https://technet.microsoft.com/itpro/windows/manage/waas-quick-start).
Users need to suspend BitLocker for Non-Microsoft software updates, such as: Users need to suspend BitLocker for Non-Microsoft software updates, such as:
- Computer manufacturer firmware updates - Some TPM firmware updates if these updates clear the TPM outside of the Windows API. Not every TPM firmware update will clear the TPM and this happens if a known vulnerability has been discovered in the TPM firmware. Users don’t have to suspend BitLocker if the TPM firmware update uses Windows API to clear the TPM because in this case, BitLocker will be automatically suspended. We recommend users testing their TPM firmware updates if they don’t want to suspend BitLocker protection.
- TPM firmware updates - Non-Microsoft application updates that modify the UEFI\BIOS configuration.
- Non-Microsoft application updates that modify boot components - Manual or third-party updates to secure boot databases (only if BitLocker uses Secure Boot for integrity validation).
- Updates to UEFI\BIOS firmware, installation of additional UEFI drivers, or UEFI applications without using the Windows update mechanism (only if you update and BitLocker does not use Secure Boot for integrity validation).
- You can check if BitLocker uses Secure Boot for integrity validation with manage-bde -protectors -get C: (and see if "Uses Secure Boot for integrity validation" is reported).
> [!NOTE] > [!NOTE]
> If you have suspended BitLocker, you can resume BitLocker protection after you have installed the upgrade or update. Upon resuming protection, BitLocker will reseal the encryption key to the new values of the measured components that changed as a part of the upgrade or update. If these types of upgrades or updates are applied without suspending BitLocker, your computer will enter recovery mode when restarting and will require a recovery key or password to access the computer. > If you have suspended BitLocker, you can resume BitLocker protection after you have installed the upgrade or update. Upon resuming protection, BitLocker will reseal the encryption key to the new values of the measured components that changed as a part of the upgrade or update. If these types of upgrades or updates are applied without suspending BitLocker, your computer will enter recovery mode when restarting and will require a recovery key or password to access the computer.