[StapleHorse]

Nice. I wonder if something like this has been ever used to exfiltrate data from some air gapped computer.

Some years ago I tried the FM transmitter via GPIO hack for the raspberry pi. The range was surprisingly high, around 100m. First google result. https://linuxhint.com/turn-raspberry-pi-fm-transmitter/

[idiotsecant]

Definitely. All you have to do is look at American military intelligence's insistence on using SCIFs for viewing and working with sensitive electronic (and physical, but for more boring reasons) documentation.

https://en.wikipedia.org/wiki/Sensitive_compartmented_inform...

They know it's important to limit what kind of emissions make it from your equipment to the outside world because they've successfully used exactly these techniques in the past to extract information from others.

[dmajor2]

It very much has been exploited since the beginning of computing https://en.wikipedia.org/wiki/Tempest_(codename)

[carapace]

Yeah. If you've ever wondered why, when you type in a password, it shows up as asterisks or dots, now you know. TEMPEST is why.