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What’s TEMPEST? Something that communicates by vibrating a table? In my dystopian future theory, the government that has no issue jamming 2 and 5 ghz channels
by ed25519FUUU 6y ago
What’s TEMPEST? Something that communicates by vibrating a table?
In my dystopian future theory, the government that has no issue jamming 2 and 5 ghz channels to keep people from talking would probably notice two people on on a table continually picking up
And dropping their phones. Why wouldn’t they simply whisper to each other in that scenario?
- gorgoiler 6y agoTEMPEST is a generic term for extracting data that emanates from channels which were are not supposed to carry data. It’s usually an attack, used to spy on people. The classic example is pointing a high speed camera at an office window across the street and recording the brightness of the walls. Even if the office computer is hidden out of sight the attacker can reconstruct what’s on screen by analysing subtle changes in brightness reflected off the wall.
- riobard 6y ago> The classic example is pointing a high speed camera at an office window across the street and recording the brightness of the walls. Even if the office computer is hidden out of sight the attacker can reconstruct what’s on screen by analysing subtle changes in brightness reflected off the wall. Is this feasible now?
- Xophmeister 6y agoYep https://www.nassiben.com/lamphone https://www.nassiben.com/lamphone
- namibj 6y agoThat was specific for CRTs. You can still exploit diffuse reflections, though that's much harder.
- maqp 6y agoThe more classic example is display cables like VGA, DVI and HDMI emanate signals that can be used to reconstruct the image displayed. Doesn't work for newer high speed HDMI though. Old BBC documentary on the topic https://www.youtube.com/watch?v=mcV6izFG3vQ https://www.youtube.com/watch?v=mcV6izFG3vQ