This reminds me of that method of reading the electromagnetic spectrum of a CRT monitor to copy its contents.
Half is conspiracy theory, half is true... finding which is which is the best part. Truck loads of salt.
Yeah, wikipedia sucks, but it's the starting point to search for serious info.
Don't rely on Wikipedia, but don't dismiss it either. It is better to have some information that you don't believe, than having none at all.
Filling a cache to get the timing of keystrokes is borderline James Bond.