As I've said before: look out for side-channels! The RF/electrical/other emissions from general-purpose CPU cores and their supporting circuitry tend to have m

As I've said before: look out for side-channels! The RF/electrical/other emissions from general-purpose CPU cores and their supporting circuitry tend to have major features with good correlations to execution timing and pipeline stalls, which they are not designed to treat as secret. This is one reason why crypto implementations should be written using techniques that avoid table lookups or branches based on secret data: another is of course that the resulting timing variations may be visible on another core, over a network, etc. Systems which treat the TSC (etc) as such secret data that they effectively seed a PRNG with it should therefore be treated with a very considerable degree of caution considering just how (literally) squeaky some cores/boards can be about leaking it. Further research is needed.