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Specify Minimum Length for BitLocker Startup PIN in Windows 10

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If you enable this policy setting, you can require a minimum number of digits to be used when setting the startup PIN.
If you disable or do not configure this policy setting, users can configure a startup PIN of any length between 6 and 20 digits.


If minimum PIN length is set below 6 digits, Windows will attempt to update the TPM 2.0 lockout period to be greater than the default when a PIN is changed. If successful, Windows will only reset the TPM lockout period back to default if the TPM is reset.


This policy setting specifies the constraints for passwords used to unlock BitLocker-protected operating system drives. If non-TPM protectors are allowed on operating system drives, you can provision a password, enforce complexity requirements, and configure a minimum length.


This policy setting specifies whether a password is required to unlock BitLocker-protected fixed data drives. If you choose to allow the use of a password, you can require that a password be used, enforce complexity requirements, and configure a minimum length.


This policy setting specifies whether a password is required to unlock BitLocker-protected removable data drives. If you choose to allow the use of a password, you can require that a password be used, enforce complexity requirements, and configure a minimum length.



4.
 The default Value data for this DWORD is 6, which means the minimum length of startup PIN should be 6. You can set the Value data from 6 to 20 on 
Decimal
 base depending upon your requirement. Click 
OK
. Close Registry Editor and reboot to make changes effective.


Hi all, i'm trying to set up bitlocker group policies on our corporate network and have run into difficulty. I have tested on my own device that everything is working - manually set up TPM, encrypted drive and so forth which went on without a problem. I have now updated GPO on the DC to allow for bitlocker keys to be uploaded to AD. Essentially we want it set up so that users have to enter a PIN on startup, and only allow TPM chips to be used - any device without will not be encrypted. Now any time I go to my bitlocker control panel to try and enable it again (and to set up the PIN) I get the error message stating the GPO settings are in conflict. I have tried many different combo's following lots of googling, but getting nowhere. The settings I have currently are:


What I have noticed is that when I run gpresult on my local machine, I only seem to be getting one setting from the GPO, which is the minimum PIN length - it was set to 4, I changed it to 5 and get the following in the output:



Block BitLocker on devices without a TPM chip:
 On a device with no TPM chip, BitLocker requires users to create an unlock password or startup key. The startup key is stored in a USB drive, which the user must connect to the device before startup. The unlock password is a minimum of eight characters. Defaults to 
Off
.



TPM startup PIN:
 This setting is the TPM + PIN unlock mode. A PIN can have up to 20 digits. Use the 
Minimum PIN length
 setting to specify the minimum PIN length. A user configures a PIN during BitLocker setup and provides the PIN during device startup.





You can get around this error by simply using a PIN containing six or more characters. By the way, the PIN length is configurable via Group Policy. To configure the TPM startup PIN length in your environment, do the following:


This error might occur when you try to encrypt a computer, and after you enter a password, but before the encryption process starts. The cause of the error is that the password does not meet the minimum number of characters that the system requires. Use a password that meets the minimu

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