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The 640 Meg Shareware Studio CD-ROM Volume II (Data Express)(1993).ISO
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ENCRYPT.DOC
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1992-02-25
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February 21, 1992
Encrypt.exe
Copyright (c) 1988 thru 1992 G. K. Pace
All Rights Reserved!
Encrypt is a files encryption utility which features an alterable
Code Key. By changing the Code Key you modify the encryption key used
to encrypt files. This utility can be used for securing your files on
a system accessible to others, and for the transfer of secured files to
others, by using a common Code Key. It is especially useful for those
transferring files via a network, and wish the files to be accessible only
by the intended recipient.
The encryption technique is simple but not easy to crack. It uses
multiple keys, which contribute to the encryption key. Thus there is not
any one key, especially the alterable Code Key which will provide a clue
to crack the encryption code. The period of repeat is very long, and
this too make the decoding of the cipher very difficult. Thus it highly
unlikely that anyone desiring to intercept a file you are sending, would
be successful in deciphering it, unless they were to use Encrypt, AND had
the Code Key you were using.
Encrypt uses a command-line argument of the form: <path\filename>
to tell it what file it is to act upon... the file must be a SPECIFIC
EXISTING file... DO NOT USE "WILD CARDS"!.
The Code-Key is one of the components of the encrypting key... and
it can be changed to suit. The Code-Key is an ASCII String of characters
including spaces (but not control characters or extended-ASCII
characters) up to twenty (20) characters in length. To change the
Code-Key run Encrypt without an argument, and follow the instructions.
Encrypt TOGGLES a file... if the file is readable, it will encrypt
it and if it is encrypted it will make it readable IF the Code Key
matches that which was used to encrypt it. If you attempt to decode a
file that you previously encrypted with a different Code Key, the file
will be encrypted further, and YOU MUST TOGGLE IT BACK, THEN CHANGE THE
CODE KEY to that which was originally used to encrypt the file and decode
it. WARNING If you encrypt a file, change Code Key, and forget what the
Code Key was for the file, you will not be able to retrieve the file. IF
YOU DO NOT KNOW THE CODE KEY USED TO ENCRYPT A FILE, YOU CANNOT DECODE
IT! Use caution when changing Code Keys... keep in mind what the old
Code Key was in case you find a file encrypted with it that you need to
decode! (this can be kept in a log, as explained below...)
Encrypt creates a log file to help you remember what you've done
with it. This file can help you by showing you what Code Key was used on
what files, and when the Code Key was changed. It also can help a person
figure out how to decode your stuff... so you may want to keep it secure!
The log-file will be located in the directory with Encrypt.exe. When
you set the Code Key, you have the option of turning file use logging off
or on (Encrypt is shipped with it ON, but default when setting is OFF) if
you do not turn it on, Encrypt will only log the changes you make to the
Code Key. If you turn file usage logging ON, it will log every usage of
Encrypt.
For FidoNet Sysops operating NetInfo as a Host, the following
example of a batch file is offered:
NetInfo c:\FidoNet\NetMail c:\FidoNet\NetFile
if errorlevel 10 goto codeboth
if errorlevel 8 goto codeshort
if errorlevel 2 goto codelong
if errorlevel 0 goto main
:codeboth
Encrypt c:\FidoNet\NetFile\NetInfo.lst
:codeshort
Encrypt c:\FidoNet\NetFile\NetInfo.txt
goto main
:codelong
Encrypt c:\FidoNet\NetFile\NetInfo.lst
goto main
Keep in mind that once you setup to use Encrypt with NetInfo you
will have to distribute Encrypt to each Sysop using NetInfo off of your
system, and you will have to use the same Code-Key! The Code-Key can be
altered at any time it is required and the new Code-Key given to the
appropriate Sysops who will be using it.
About Licensing... Encrypt is copyrighted material, and all rights
to it are reserved. You can use it for a limited time to try it out...
but must register it for continued use. License fees are reasonable, and
FidoNet Sysops operating a Public accessible, non-fee, Bulletin Board
System, or FidoNet Sysops operating a "Host" mail-only system which is
operated on a non-fee basis serving others in the FidoNet, will find the
registration fee to be very reasonable... commercial users, Government
users, and anyone who charges users a fee will pay a little more for the
use of Encrypt. <This is my policy on all of my FidoNet utilities>
Also those who register NetInfo, will receive the use of Encrypt as a
bonus...
For further information, comments, criticism, or to register the use
of Encrypt, please contact me at:
G. K. Pace
3935 Baker Ave.
Titusville, Fl. 32796
(407)269-3088 (voice)
(407)269-9844 (BBS)
FidoNet @ 1:374/26
PS: Have a good day!