It's also just called tempest, it's mostly a nsa thing. They can eavesdrop on crypto from across the street, well that was in the 50s, thats what we learned about 40 years later, god only knows what they can do today.
I would link something, but there isnt even anything useful about it on the internet, that google can find anyway.
I would link something, but there isnt even anything useful about it on the internet, that google can find anyway.