From: Tom Zerucha <root@deimos.toad.com>
Date: Tue, 26 Dec 1995 09:15:39 +0800
To: Jason Rentz <andr0id@midwest.net>
Subject: Re: ex encrypted script
In-Reply-To: <199512202339.RAA05220@cdale1.midwest.net>
Message-ID: <Pine.LNX.3.91.951225181018.618A-100000@deimos>
MIME-Version: 1.0
Content-Type: text/plain


On Wed, 20 Dec 1995, Jason Rentz wrote:

> Forgive me if this is a stupid question.
> 
> I'm using AT&T unix Version 5 release 3.2.2  ( UNIX System V/386 Release 3.2)
> 
> I have several simple scripts that are simple yet handle important realtime
> call proccessing tasks and remote control operations.  These programs are my
> programs but are running on a system that is dialed into by the vendor once
> in a while.  
> 
> Is there a way to encrypt a script yet still allow it to be runnable?  I
> know that the simple answer is to write it in C and compile it but I don't
> have the means of doing that at the moment.  (i.e. there is not compiler on
> the system)

You can try something similar to what gzexe does, but...

> I thought of a few simple protections but they all involve decrypting before
> running.

...unless the CPU has built in decryption this will be a necessity.  A 
compromise might be to put this into the kernel

zerucha@shell.portal.com
finger zerucha@jobe.portal.com for PGP key