InvalidError :
I'm pretty sure I can write a 100% secure 1Hz blinker firmware for an ATtiny8 micro-controller, it'll be as secure as the controller itself can be
I doubt it. I bet you $100 I'll be able to re-flash your attiny with my own malware, even if you go to the trouble of disabling the reset fuse so that it can't be re-flashed.
A mere 12v to the reset line and the tiny goes blank, ready to accept my own 2Hz blink routine!
The big problem outlined in this article is that apple secured one entry, while leaving a gaping back-door unprotected.
"Lets secure the door and use that as marketing to tell everyone how secure our devices are" while leaving door B wide open.