                         =====
                         D E S
                         =====


DES.EXE implements the full DES (data encryption standard). The source
was originally published by the DDJ journal and trimmed for size and speed.


Why this is useful:
-------------------
I keep some confidential information on my Atari Portfolio. Loosing my PORT
would be bad enough without worrying about possible abuse of this 
information.

IMPORTANT:
==========
- Don't try the following steps with your valuable data but with some 
  TEST file.
- If you forget your password, there's no way to get your data back (Well,
  secret services probably can break DES, but who cares).
- Keep the size of the encrypted data to a minimum, to save time. 
  DES is a complicated algorithm that takes a long time to encrypt
  large files. 


How to install:
---------------
1.  Copy the files DES.EXE, FAKE.COM and PW.BAT into one of your PATH 
    directories.
    If you don't have a PATH statement in your AUTOEXEC.BAT file, copy to
    your RAM Card, "A:\".

2.  Set up an adress file A:\PWD.ADR that contains all your confidential data.
    Use the clipboard 'cut and paste' function for moving information into
    this file.

3.  Select a password (6-8 characters), like 12345678
    Execute the command 
         PW <your password>
    Example: PW 12345678

4.  The screen will be cleared, and the message "Decrypting..." will
    show for a few seconds (or a few MINUTES if you have a large file).
    My file is around 500 Bytes and takes about 5 seconds to decrypt.

5.  The addressbook will be started with your data loaded.
    Quit by hitting ESC.
    The message "Encrypting..." will be displayed. Wait till encryption
    is complete.

6.  Your data is now encrypted and PWD.ADR has been replaced with
    PWD.DES.

How to use it:
--------------
To view/edit your confidential data just type in
   PW <password>

WARNING: You data is NOT secure while it is loaded into the addressbook!

How it works
------------
DES.EXE is used for encrypting and decrypting the file PWD.DES from/to
the address file PWD.ADR.
FAKE.COM is used to load the decrypted data automatically into
the address book.
When the address book terminates, PWD.ADR is re-encrypted into PWD.DES
and PWD.ADR is deleted.


des.exe          8843  23.01.91  22:15 
fake.com          640  23.04.90  18:06 
pw.bat            347  27.01.91  10:59 


Comments and suggestions are welcome.

Bernhard Brunner, 
Schochenwinkel
8595 Altnau

CompuServe [100016,1104]
