As far as tamper resistant PC hardware... it sounds like you are looking for
something like Microsoft's SYSKEY ability to render the OS usless without a
type of bootable key (Floppy and/or password). Even if you were to install
such a program your would be attacker would be able to circumvent any such
program by accessing the disk as data instead of a system partition.
If the level of security is as important as you indicate. I would recomment
rigging a little extra current to be fed into the HD apon entry of the box.
You could design the circuit to be a simple switch with a photosensitive
diode. As soon as light hit the diode that baby would conduct and munch away
at your HD. Just an idea, I'm sure we could get creative with such a design.
-Scotty
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