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Alexa and Siri Can Hear This Hidden Command. You Cant.

Now the technology is racing even further ahead of the law. Last year, researchers at Princeton University and China’s Zhejiang University demonstrated that voice-recognition systems could be activated by using frequencies inaudible to the human ear. The attack first muted the phone so the owner wouldn’t hear the system’s responses, either. The technique, which the Chinese researchers called DolphinAttack, can instruct smart devices to visit malicious websites, initiate phone calls, take a picture or send text messages. While DolphinAttack has its limitations — the transmitter must be close to the receiving device — experts warned that more powerful ultrasonic systems were possible. That warning was borne out in April, when researchers at the University of Illinois at Urbana-Champaign demonstrated ultrasound attacks from 25 feet away. While the commands couldn’t penetrate walls, they could control smart devices through open windows from outside a building. This year, another group of Chinese and American researchers from China’s Academy of Sciences and other institutions, demonstrated they could control voice-activated devices with commands embedded in songs that can be broadcast over the radio or played on services like YouTube. More recently, Mr. Carlini and his colleagues at Berkeley have incorporated commands into audio recognized by Mozilla’s DeepSpeech voice-to-text translation software, an open-source platform. They were able to hide the command, “O.K.

For the original version including any supplementary images or video, visit https://www.nytimes.com/2018/05/10/technology/alexa-siri-hidden-command-audio-attacks.html

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