Inference of key shape from the sound it makes in the lock

August 20, 2020

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Researchers from the National University of Singapore found a way to infer key shape based on the sound the lock makes when you insert the key.

First they capture a sound recording with a standard microphone. Then they run the audio file through software to filter out the metallic clicks. This provides a time series from which they can infer likely keys.

Soundarya Ramesh presented the work at HotMobile 2020 in the talk below:

Oh to be back in graduate school again. [via kottke]