What kind of equipment would be required to sniff data from the electromagnetic emissions of data / address buses on an average motherboard?
I'd imagine a sensitive hall probe, a faraday cage and some expensive analysis equipment (e.g. spectrum analyser) would be necessary, racking up a pretty significant cost, but I don't really have any sources to suggest that this is correct or incorrect.
Anyone had any experience in this field? Are there homebrew methods, or is this the kind of attack that requires significant resources to pull off?