Benefits of Coherent Demodulation for Eavesdropping on HDMI Emissions
Year: 2024
Type: conference-paper
Abstract: Demonstrations of electromagnetic eavesdropping attacks on digital video-interface cables usually first amplitude-demodulate the received signal, then resample the result into pixel-aligned raster images, and finally average consecutive video frames obtained this way. This non-coherent process discards useful phase information. Software-defined radio receivers allow us to coherently demodulate and average such signals, using a linear process that preserves phase information. We describe techniques for performing phase-coherent resampling and periodic averaging of compromising emanations from HDMI video cables and demonstrate how the preserved phase information enables better discrimination of on-screen colours.
Authors: Dimitrije Erdeljan, Markus G. Kuhn
Institution: University of Cambridge
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4403760929