HDMI Cables May Leak Your Screen Content
Researchers demonstrated that video can be recovered from radio signals emitted by an HDMI connection. Deep-TEMPEST uses AI to improve the reconstructed image and text readability.
HDMI cables may leak your screen content
In the demonstration, a laptop recovers video playing on a nearby monitor solely from radio signals emitted by an HDMI connection.
The setup uses TempestSDR: an antenna captures side electromagnetic emissions, a HackRF radio device receives the signal, and software reconstructs the image.
Researchers went further and developed Deep-TEMPEST, applying artificial intelligence to improve the clarity of reconstructed images and the readability of text. The video, however, shows the original method.
Reconstruction quality depends on cable shielding, distance, and electromagnetic interference. The image may be imperfect, but its content can still be recognizable.
Even a wired connection can leave a trace in the radio spectrum.
Why it matters
AnalysisIt highlights physical side-channel risks: unshielded HDMI cables can expose sensitive screen content to nearby radio eavesdropping.
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