Couldn't this sort of attack be defeated simply by putting the processor, memory, power supply, and some sort of UPS (maybe with some sort of randomized power intake algo) inside a faraday cage? Such a cage could be built as a desktop computer case, I suppose. And, if the designers for the UPS were clever enough they could probably combine it with the power supply into a package small enough to fit in the same spot a typical power supply would go.
I suppose one could then read the thermal output of the cooling system, but it seems like that would be pretty easy to randomize by introducing delays and dumps.
Biting the hand that feeds IT
