intel x86 considered harmful.
Present-day computer and network security starts with the assumption that there is a domain that we can trust. For example: if we encrypt data for transport over the internet, we generally assume the computer that’s doing the encrypting is not compromised and that there’s some other “endpoint” at which it can be safely decrypted.
To trust what a program is doing assumes not only trust in that program itself, but also in the underlying operating system. The program’s view of the world is limited by what the operating system tells it. It must trust the operating system to not show the memory contents of what it is working on to anyone else. The operating system in turn depends on the underlying hardware and firmware for its operation and view of the world.
So computer and network security in practice starts at the hardware and firmware underneath the endpoints. Their security provides an upper bound for the security of anything built on top. In this light, this article examines the security challenges facing us on modern off-the-shelf hardware, focusing on Intel x86-based notebooks. The question we will try to answer is: can modern Intel x86-based platforms be used as trustworthy computing platforms?