The "SkullConduct" setup was devised by university researchers in Germany and works on a modified pair of Google Glass. Using the integrated bone conduction speaker and microphone, the device played an imperceptible sound that was then picked up by the microphone. A test device was able to correctly identify the user 97 percent of the time in a lab.
While the researchers originally envisioned the system as a way to keep unwanted users from accessing devices like Glass, Gizmodo thinks it could potentially be another TouchID for your skull. Imagine, if you will, a scenario where you can unlock your phone by placing it against your ear. But, then again, who actually takes phone calls anymore?