----- Original Message -----
From: Mike Mansheim <Michael_J_Mansheim@GRACO.COM>


> >> Is this all still true?
>
> > You are completely protected in these circumstances.
>
> > Yes.

So, how hard is it to have a field reprogrammable unit that uses ICSP?
Would it take a small pic external to the '77 to re-code RS232 to the ICSP
signal?  Unfortunately it would appear that that link would still be weak as
it wouldn't be encrypted.

I stayed out of the thread as I wasn't sure what the issues were.

I can definitely see where Ron was troubled as his requirements seem to have
him in a bind.  To have a secure remotely programmable device is a tricky
proposition, where Ron has what I would guess a decrypter in the bootloader
to write the data, so the chip and data file you send to customers isn't
readily crackable.

I am curious if any other major uC lines have this sort of problem?

I am not really familiar with much other than the PIC, but I've made a few
programs for the 505x & 68HC11, neither seem to have anything that's all
that conducive to such security measures, but there are plenty of clones
that might.

Jeff

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