Message-Id:	<m0yr0kY-000S45C@inti.gov.ar>
Comments:	Authenticated sender is <salvador AT natacha DOT inti DOT gov DOT ar>
From:	"Salvador Eduardo Tropea (SET)" <salvador AT inti DOT gov DOT ar>
Organization:	INTI
To:	sparhawk AT eunet DOT at (Gerhard Gruber), djgpp AT delorie DOT com
Date:	Tue, 30 Jun 1998 10:53:35 +0000
MIME-Version:	1.0
Subject:	Re: This is not a problem but...
In-reply-to:	<359ee3c4.2998738@news.Austria.EU.net>

sparhawk AT eunet DOT at (Gerhard Gruber) wrote:

> Destination: Dim Zegebart <zager AT post DOT comstar DOT ru>
> From: Gruber Gerhard
> Group: comp.os.msdos.djgpp
> Date: Mon, 29 Jun 1998 09:25:13 +0400:
> 
> >most known or just XOR). SO, your strings now looks like a garbage and
> 
> XOR is pretty boring. If you know what you are searching for, it is a matter
> of minutes to locate and change something encoded with XOR.

You don't even need to know what to search, if they are strings the 
space frequency and the limited range (a-z A-Z) makes the task 
trivial. XOR isn't a solution, at least not if you use a static value 
for the XOR. A dinamic value can be used giving a little more of 
security but it can be breaked anyways. 
Some time ago I did a small batch and I wanted to protect it because 
it had a password so I converted the .bat to .com, then the .com to 
.exe, then compressed the exe and finally encripted it. Looks secure 
no? ... not at all, a couple of years latter I lost the password so I 
was forced to break my "secure" system. It took me less than 10 
minutes using a debugger ;-)

SET
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Visit my home page: http://set-soft.home.ml.org/
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Salvador Eduardo Tropea (SET). (Electronics Engineer)
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