Researchers have demonstrated that a laser beam or a high-frequency electromagnetic (EM) wave can be used to remotely and inaudibly gain control of a voice-based virtual assistant. This disclosure describes techniques to protect a voice assistant device from such laser or EM attacks. The techniques leverage the differing sensitivities of the multiple microphones of a virtual assistant device to a laser or to EM waves to flag a received voice command as authentic or suspicious. The techniques also determine a user’s proximity to the virtual assistant device to determine if a received command is authentic or suspicious.
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Yang, Zhiping, "Protecting Voice-Activated Devices from Laser or Electromagnetic Attacks", Technical Disclosure Commons, (March 02, 2020)