Associates a DES algorithm Message Authenticate Code (MAC) value
    with one or more files and checks for any modification of either
    plain text or cipher text files. Use the additional /UPDATE
    qualifier to store each file's MAC in the databases. Use only
    the /AUTHENTICATE qualifier to subsequently test the integrity
    of the file's data and security attributes. You must create a
    DES key prior to updating or checking an existing MAC. The AES
    algorithm is not supported for file MAC operations.

    Format for the ENCRYPT /AUTHENTICATE Command

      ENCRYPT /AUTHENTICATE  file-spec key-name [qualifiers]