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SUMMARY:Benefits of coherent demodulation for eavesdropping on HDMI emissi
 ons - Dimitrije Erdeljan
DTSTART:20240830T130000Z
DTEND:20240830T133000Z
UID:TALK220486@talks.cam.ac.uk
CONTACT:Markus Kuhn
DESCRIPTION:Demonstrations of electromagnetic eavesdropping attacks on dig
 ital video-interface cables usually first amplitude-demodulate the receive
 d signal\, then resample the result into pixel-aligned raster images\, and
  finally average consecutive video frames obtained this way. This non-cohe
 rent process discards useful phase information. Software-defined radio rec
 eivers 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 comprom
 ising emanations from HDMI video cables and demonstrate how the preserved 
 phase information enables better discrimination of on-screen colours.\n\n(
 Practice talk for EMC Europe 2024)
LOCATION:Computer Laboratory\, William Gates Building\, Room FW11
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