Researchers from the University of Michigan have developed a system called "VAuth" to protect people from voice hacking. The voice is being increasingly used to control devices and for biometric identification, and there are plenty of examples of voices being recorded and modulated or even copied by the right kind of software. "VAuth" works to prevent all that. The hardware can be worn as a necklace, ear buds or glasses attachment. The system includes an accelerometer that detects subtle vibrations in the skin of the wearer's face, throat or chest as they speak.