Hector Martin

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!

He could do CPU temperature (although bit rate would be even lower).