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New PIXHELL Attack Exploits Screen Noise to Exfiltrates Data from Air-Gapped Computers
(thehackernews.com)
this post was submitted on 10 Sep 2024
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Cybersecurity
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just curious but from your experience is Displayport just as bad or is it worse than HDMI for this exploit?
I didn't test displayport, but IIRC it's digital, like HDMI is. So, my guess is that Displayport also emanates lots of EM interferences. The very sharp nature of squarey digital waves (in contrast to a sinusoidal wave from analog) decomposes into high-frequency interferences (because a square wave always has high frequency components, as observed through FFT). That's what causes UHF interference.