Well exactly what I mean.  I want the to not get to the logic analyzer
stage.  I could blow the pin like you said in your last message.  However,
my fear still exists cause the code is only a small part like you said.  I
was thinking of using a PIC16f877 and code self destruct routines...  I
think I need an MCU that large anyhow.

Darren King

----- Original Message -----
From: The Old Crow <chip@OLDCROWS.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, November 29, 1999 1:19 PM
Subject: Re: Pic Self Destruct?


> On Tue, 23 Nov 1999, Darren King wrote:
>
> > Really its not so much the code, but how the device works in certain
> > situations can really give away certain keys to everything.  Who needs
the
> > code when you could write code to make it do that anyhow...  Inside a
box
> > its not so obvious but reverse engineering is about 90% just figuring
out
> > HOW it pulls of what it does.
>
>   When I reverse-engineered a little PIC that later was to become known as
> the "Playstation Mod Chip", this is precisely how I did it.  I did not
> care what code was inside the PIC, I just stuck my logic analyzer on the
> I/O pins and observed the timing tables the part generated.  My first try
> at duplicating the function wasn't even written in PIC assembly, it was
> written in Z8 assembly.  What then followed has long since passed into
> folklore...
>
>   "What one man can invent, another man can discover."  --Sherlock Holmes
>
>    --Crow
>
> /**/
>