What motivates a person to give a talk like this at Blackhat? A method to compromise cpus by feeding them secret instructions seems like trouble the world doesn't need. Sure, he's only focused on an outdated system, but he's shown how to do it, and even gives away the tool. Is it like making smallpox virus available, so it can be studied? But how can hardware designers make any system safe from such tenacious probing? Imagine how different the world would be if there was no threat of exploitation.