It is also useful in nature to know how to deal with backdoor and how to prevent collusion. Obsfucation of functions and breaking down, randomising and inclusion of redundancy into logic codes can help to confuse attackers trying to extract the code but also serves to confuse the internal backdoor watching the code. If you break down an AES function and step them through at a seemingly random timing and phase, how would a backdoor logic know when you are going to execute an AES logic in software.
Another method is to share the logic between multiple chips so one does the MixColumn and one does the KeyAdd and so forth. Adding additional chips as Minitor chips (chips that are trusted if exist :)) can be used in the Prison scenario as well to check obsfucated split code executions.
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Interesting account by Nick Gammon of what went into creating G-Pascal: a 16k Pascal implementation written in assembly for Apple 2 and later Commodore64. I knew it was going to be good when he starts out with a hand-soldered computer and the method he used to enter the hex codes. Just got more interesting. This guy is something else.
Enjoy watching the fun, though. Bonus for you: imagining the difficulty of my testing it with kludgy code I learn as I go in whatever lang supports my version of Linux and battling the RNG issues. Should be fun when I get to it. 2ff7e9595c
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