kbd-audio

https://github.com/ggerganov/kbd-audio is probably the best-known one. The amusing aspect is that this is so easy that multiple good ways someone could hobby program this long before AI was a thing. The sound of a bunch of keypresses may just blur together to our human ears, but if you try, you can tell that different keys make different noises, which is really the key insight. Between the different noises, the possible directionality you can get from a stereo (or more) pickup, and characteristic delay patterns during typing various bi-grams, there's a ton of information leakage in a recording of a keyboard.

Talking of smart people, check out Georgi Gerganov's keyboard audio tools: https://github.com/ggerganov/kbd-audio He's subsequently well known for llama.cpp.

https://github.com/ggerganov/kbd-audio It's quite good at decoding my own typing, although I am a quite aggressive typist and that may help. I haven't tried it on others, though (honest, officer).

It's not 15 years ago but I remember this[0] being shared on HN 5 years ago. I can't find them at the moment but I also do remember seeing whitepapers outlining the same techniques before that. This one is interesting to me, now, considering who the author is. [0] https://github.com/ggerganov/kbd-audio

Georgi Gerganov created one a few years ago https://github.com/ggerganov/kbd-audio

> Acoustic keyboard eavesdropping — ggerganov/kbd-audio https://github.com/ggerganov/kbd-audio?ref=scopeofwork.net

Since when we talk, our tongues tap patterns on the roof of the mouth and the back of the teeth, I wonder if AI processing could infer what words you are shaping from these sensors. Maybe it’s possible to input text by mouthing words silently, but without opening your mouth. Kind of like how it’s possible to eavesdrop from just the sound of keyboard clicks: https://github.com/ggerganov/kbd-audio

You can be spied with a microphone: https://github.com/ggerganov/kbd-audio

There's some interesting attacks based on working out the sound of each key on a keyboard and then guessing keystrokes - https://github.com/ggerganov/kbd-audio

Sounds like the author has the same experience: if the keyboard is not mechanical, then this library doesn’t work: https://github.com/ggerganov/kbd-audio/issues/3