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1989-08-19
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4KB
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73 lines
Mark J. Gustitis org880626
rev890819
CODE
(File encryption/decryption system)
****************************************************************************
* *
* NOTICE *
* *
* This is a DUAL-MODE program. It will run under_both_MS/PC-DOS 3.x, AND *
* PROTECTED MODE OS/2. It is NOT a bound program. It actually contains *
* two versions of the program in one .EXE file. The operating system *
* determines which one to use at run time. *
* *
****************************************************************************
Type CODE masterkey drv:\path\source <cr>
--OR--
Type CODE<cr> from the DOS or OS/2 prompt
Respond to: With:
=========== =====
Enter master key: A string containing at least
one alphabetic or numeric character
(punctuation is ignored)
(spaces are illegal )
Enter file name: The drv:\path\filename
of the file to en/de-code
Wildcards (* and ?) are allowed in the file name.
CODE will en/decrypt any standard dos file (text,exe,com &c).
The program will abort if the file is hidden or read-only.
Note:
If you just press ENTER to any prompt, the program will abort.
You MUST use the EXACT same master key to decode a file as you
used to encode it, otherwise the results will be garbage.
Since the number of permutations possible of the master key is
essentially infinity, the possibility of breaking an encryption,
even with the CODE program, is essentially zero.
Running CODE with the SAME master-key on a file that is already
encrypted, results in a DECODED file.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
CHALLANGE:
The FORTRAN source code for the program is enclosed in the archive, however
it is encrypted. Your job is to determine the master-key I used in
coding the file. (work on a copy..using the wrong key results in jibberish)
If you do happen to break the code, let me know by e-mail to GeNIE address
M.GUSTITIS what master-key did it. You won't win anything, but I will be
very impressed.
P.S. The source code is for the MS-DOS real-mode version.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
ANTI-WARRANTEE
This program is provided on an as-is basis. The user is responsible for
its use or mis-use. Since data is altered, be sure you have unencrypted
copies of your file before you start fooling with CODE. A word to the
wise is sufficient.
=============================================================================
890819
=============================================================================