<Li> Windows Server 2008 and later </Li> <Tr> <Th_colspan="2"> Related components </Th> </Tr> <Tr> <Td_colspan="2"> Encrypting File System </Td> </Tr> <P> BitLocker is a full disk encryption feature included with Windows Vista and later . It is designed to protect data by providing encryption for entire volumes . By default it uses the AES encryption algorithm in cipher block chaining (CBC) or XTS mode with a 128 - bit or 256 - bit key . CBC is not used over the whole disk; it is applied to each individual sector . </P>

When does bitlocker decrypt files in the volume