Choose drive encryption method and cipher strength (Windows 10 [Version 1511] and later)

This policy setting allows you to configure the algorithm and cipher strength used by BitLocker Drive Encryption. This policy setting is applied when you turn on BitLocker. Changing the encryption method has no effect if the drive is already encrypted, or if encryption is in progress.

If you enable this policy setting you will be able to configure an encryption algorithm and key cipher strength for fixed data drives, operating system drives, and removable data drives individually. For fixed and operating system drives, we recommend that you use the XTS-AES algorithm. For removable drives, you should use AES-CBC 128-bit or AES-CBC 256-bit if the drive will be used in other devices that are not running Windows 10 (Version 1511).

If you disable or do not configure this policy setting, BitLocker will use AES with the same bit strength (128-bit or 256-bit) as the "Choose drive encryption method and cipher strength (Windows Vista, Windows Server 2008, Windows 7)" and "Choose drive encryption method and cipher strength" policy settings (in that order), if they are set. If none of the policies are set, BitLocker will use the default encryption method of XTS-AES 128-bit or the encryption method specified by the setup script."

Select the encryption method for operating system drives:

0. AES-CBC 128-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsOs
   Value Type	REG_DWORD
   Value	3

1. AES-CBC 256-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsOs
   Value Type	REG_DWORD
   Value	4

2. XTS-AES 128-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsOs
   Value Type	REG_DWORD
   Value	6

3. XTS-AES 256-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsOs
   Value Type	REG_DWORD
   Value	7

Select the encryption method for fixed data drives:

0. AES-CBC 128-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsFdv
   Value Type	REG_DWORD
   Value	3

1. AES-CBC 256-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsFdv
   Value Type	REG_DWORD
   Value	4

2. XTS-AES 128-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsFdv
   Value Type	REG_DWORD
   Value	6

3. XTS-AES 256-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsFdv
   Value Type	REG_DWORD
   Value	7

Select the encryption method for removable data drives:

0. AES-CBC 128-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsRdv
   Value Type	REG_DWORD
   Value	3

1. AES-CBC 256-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsRdv
   Value Type	REG_DWORD
   Value	4

2. XTS-AES 128-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsRdv
   Value Type	REG_DWORD
   Value	6

3. XTS-AES 256-bit
   

   Registry Hive	HKEY_LOCAL_MACHINE
   Registry Path	SOFTWARE\Policies\Microsoft\FVE
   Value Name	EncryptionMethodWithXtsRdv
   Value Type	REG_DWORD
   Value	7