Benefits of coherent demodulation for eavesdropping on HDMI emissions

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• Dimitrije Erdeljan
• Friday 30 August 2024, 14:00-14:30
• Computer Laboratory, William Gates Building, Room FW11.

If you have a question about this talk, please contact Markus Kuhn.

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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.

(Practice talk for EMC Europe 2024)

This talk is part of the Computer Laboratory Security Group meeting presentations series.

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