[arboroia]

Ridiculously impressive and extremely hard to shield against, baring using your computer in a faraday cage.

Thinking about it, is there any way to vary the electricity consumption of the computer as to transmit that way if it was in such a cage?

[9wzYQbTYsAIc]

Computer enclosure and server rack manufacturers might have a new market for built-in Faraday cages.

[brohee]

TEMPEST hardened computer certainly isn't a new market, see e.g. http://apitech.com/products/sn6730tf-tempest-laptop-notebook...

It is however a very niche market. For server rooms, it's much cheaper to harden the room, which limits the market to desktop and notebooks...

[opless]

Yes. http://www.simonwaite.com/random-thoughts/communication-from...

[yk]

It should be possible to vary the sleep states of the processor, at least if you are root. That should give you something like 50 W amplitude. No idea how that would look on the other side of the power supply.

[tedunangst]

It's pretty obvious, but perhaps worth noting that this requires the malware be installed on the computer somehow. That in itself is probably a challenge for an air gapped computer.

[jacobwcarlson]

Not if you access to the supply chain for the construction of the computer.