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  1.  
  2.           LOCK (and UNLOCK)                       Steven Holzner
  3.           Commands                                        No. 14
  4.  
  5.           ______________________________________________________
  6.  
  7.           Purpose:  Encrypts a file, rendering it unreadable to
  8.                     anyone who does not know the user-chosen
  9.                     passphrase.  Complementarily, using the same
  10.                     passphrase, de-encrypts the file.
  11.  
  12.           Format:   LOCK [d:][path]filename[.ext] [d:][path]
  13.                     [filename][.ext]
  14.                                  or
  15.                     UNLOCK [d:][path]filename[.ext] [d:][path]
  16.                     [filename][.ext]
  17.  
  18.           Remarks:  The user-selected passphrase can be up to 64
  19.                     characters in length; the programs prompt you
  20.                     to supply it.  Files to be LOCKed and
  21.                     UNLOCKed must be less than 62K in length.  If
  22.                     you do not supply new filenames for the
  23.                     locked and unlocked files, the programs use
  24.                     the default filename FILE.LOC.
  25.  
  26.           Example:  You have a file of student course evaluations
  27.                     named CONFY on drive C: that you wish to mail
  28.                     to a colleague in encrypted form.  You put a
  29.                     formatted floppy disk in drive A:, and at the
  30.                     C> prompt you enter
  31.  
  32.                          LOCK CONFY A:CRIMSON
  33.  
  34.                     When the program asks for a passphrase, you
  35.                     enter VERITAS.
  36.  
  37.                     The CRIMSON file on the disk will be
  38.                     unreadable.  When your colleague--who must,
  39.                     of course, be told the passphrase you have
  40.                     used--puts the disk in his machine, he types
  41.  
  42.                          UNLOCK CRIMSON GUIDE
  43.  
  44.                     When prompted, he supplies the passphrase
  45.                     VERITAS, and his file GUIDE will be identical
  46.                     to your original file CONFY.
  47.  
  48.                     Notes:
  49.  
  50.                     1.   LOCK and UNLOCK do not delete any files,
  51.                          original or encoded.
  52.  
  53.                     2.   Requires DOS version 2.0 or later.
  54.