Start with security in the MCU chip design and work your way up from there. If we can't secure computers they are very soon going to become useless. They are

Start with security in the MCU chip design and work your way up from there. If we can't secure computers they are very soon going to become useless. They are already starting to feel like they are more trouble than they are worth (ransomware and other attacks are destroying the functioning of health care, government, the military, and more), and I say that as someone who has spent their whole life working with them and likes them. I worked on computer security research over the last decade and there was a lot of hand waving ("APT's are too difficult to protect against, so we won't consider that, it's out of scope"). Now the chickens are coming home to roost and APT's are indeed a concern at every level. It only takes one person to turn an APT into a scripted hack that anyone can use (witness what has been happening with the CIA's revealed attacks). Supply chain security is a new concern when it should have been obvious for decades. The alternative is to build a world where everyone is nice. This is the preferred solution but it seems more difficult to create than a secure system for computing. Maybe one approach to secure computing would be to invent a new paradigm for non-networked computing that does everything we can do now, but is just slower to use.