Copying a Key by Listening to It in Action
Schneier on Security
AUGUST 20, 2020
Researchers are using recordings of keys being used in locks to create copies. Once they have a key-insertion audio file, SpiKey's inference software gets to work filtering the signal to reveal the strong, metallic clicks as key ridges hit the lock's pins [and you can hear those filtered clicks online here ]. These clicks are vital to the inference analysis: the time between them allows the SpiKey software to compute the key's inter-ridge distances and what locksmiths call the "bitting depth" of
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