Voice-checking device stops hackers hijacking your Siri or Alexa

Does your digital assistant know who it's talking to? A wearable device prototype could let voice-controlled assistants like Apple's Siri or Amazon's Alexa recognise their owner so they don't take orders from anyone else. The VAuth device, developed at the University of Michigan in Ann Arbor, uses an accelerometer hidden in a pair of glasses or earphones or worn around the neck. The accelerometer measures vibrations created as the wearer speaks. An algorithm then compares those vibrations with the audio signal received by the digital assistant. If the vibrations and the audio match, then the voice command is received as normal.