How to increase maximum BitLocker password length?

How do I increase the maximum number of characters allowed in the BitLocker password? The current maximum is 20. I know that it's possible, because I have a second machine where the length is 8-256 characters.

• The group policy option "Allow enhanced PINs for startup" does not seem to have an effect
• The Powershell command Add-BitLockerKeyProtector is limited by the same restrictions.
• On my second machine, no other BitLocker group policies are enabled.
• I have Windows10 Pro, 21H2, 19044.1288.

Any suggestions?

3

1 Answer

I think you are confusing different concepts:

• BitLocker PIN has maximum length of 20. Only its minimum length is modifiable in the Group Policy Editor.

• BitLocker Password has maximum length of 256 characters long.

• BitLocker Recovery Password has maximum length of 48 digits.

For password, you need to useAdd-BitLockerKeyProtectorwith the parameters of -PasswordProtector and -Password like this:

$encpass = ConvertTo-SecureString -AsPlainText -String "yourpassword" -Force
Add-BitlockerKeyProtector -MountPoint C:\ -Password $encpass -PasswordProtector

You may also do this the traditional way:

manage-bde -protectors -add c: -password "yourpassword"

1

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