UI Side Channel Snooping• Victor switches to an LCD display. Any other waysAnn can still steal his display contents or hiskeystrokes?• Cables from computer to screen & keyboard act ascrude antennas!– Broadcast weak RF signals corresponding to datastreams– Even induce faint voltage fluctuations in power lines• Keystrokes create sound– Audio components unique per key– Timing reflects key sequencing / touch typing patterns• If language known, can employ spell-checking to clean up errors– Can “listen” from a distance using laser + telescope!UI Side Channel Snooping• Victor switches to an LCD display. Any other waysAnn can still steal his display contents or hiskeystrokes?• Cables from computer to screen & keyboard act ascrude antennas!– Broadcast weak RF signals corresponding to datastreams– Even induce faint voltage fluctuations in power lines• Keystrokes create sound– Audio components unique per key– Timing reflects key sequencing / touch typing patterns• If language known, can employ spell-checking to clean up errors– Can “listen” from a distance using laser +
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