SurfingAttack is a technique that uses ultrasonic waves to trigger commands, through personal assistants, without alerting the owner of the device. Researchers from Washington University in St. Louis found that Android and iPhone devices are susceptible to the technique. The researchers managed to build a proof-of-concept demo that illustrates how this attack would take place in the real world. The technique worked very well thorough wood and metal, from distances of up to 30 feet. The attackers need to imitate the voice of the owner in cases where the phone assistant is trained to recognize the owner’s voice.”]