If this were a movie, we’d be laughing at the improbability of the premise — that encryption can be cracked by listening to the high-pitched sounds produced by a computer’s CPU as it decrypts data. But it’s real, and although it can be done at a distance of 4 meters with a parabolic microphone, the researchers (Daniel Genkin, Eran Tromer, and Adi Shamir, who is the S of the RSA cryptosystem) also showed that it could be done with a smartphone sitting next to a laptop. Upping the ante, they suggest that a microphone hidden inside a colocated server could eavesdrop on numerous nearby servers. In short, if security is paramount, both heavy-duty encryption and physical protection are necessary. follow link
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Encryption Cracked by Listening to a Computer’s CPU
It does not matter how hard people try to hide under the bed, someone will poke under it with a boom handle some time or another. there is no way to save a computer from someone else, if they really want to see what you are doing... They will...
As far as electromagnetism is concerned, we all live in glass houses. Just keep building better blinds.