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Department of Computer Science and Technology

Date: 
Friday, 30 August, 2024 - 14:00 to 14:30
Speaker: 
Dimitrije Erdeljan
Venue: 
Computer Laboratory, William Gates Building, Room FW11

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)

Seminar series: 
Security Group meeting presentations

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