Now a new technique called SurfingAttack can send ultrasonic waves through solid objects. ![]() Researchers have previously demonstrated how they could trick a phone by sending these waves through the air, but the approach required proximity to the victim and was easily disrupted by nearby objects. Yet they also potentially let hackers do the same things by bombarding the device’s microphone with ultrasonic waves (sounds with frequencies higher than humans can hear). ![]() Voice assistants allow smartphone users to snap a photograph or send a text with a spoken command.
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