ex encrypted script

[Tom Zerucha]

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