<P> The Encrypting File System (EFS) on Microsoft Windows is a feature introduced in version 3.0 of NTFS that provides filesystem - level encryption . The technology enables files to be transparently encrypted to protect confidential data from attackers with physical access to the computer . </P> <P> EFS is available in all versions of Windows developed for business environments (see Supported operating systems below) from Windows 2000 onwards . By default, no files are encrypted, but encryption can be enabled by users on a per - file, per - directory, or per - drive basis . Some EFS settings can also be mandated via Group Policy in Windows domain environments . </P>

What file system supports the use of efs