From ehackingnews.com
Earlier this year researchers at the National University of Singapore came up and published a paper enumerating how, utilizing just a smartphone microphone and a program designed by them, a hacker can clone your key.
The key, named SpiKey, is the sound made by the lock pins as they move over a typical key’s edges.
The paper written by Soundarya Ramesh, Harini Ramprasad, and Jun Han, says that “When a victim inserts a key into the door lock, an attacker walking by records the sound with a smartphone microphone.”