Researchers have demonstrated the ability to send inaudible commands to voice assistants like Alexa, Siri, and Google Assistant. Over the last two years, researchers in China and the United States have begun demonstrating that they can send hidden commands that are undetectable to the human ear to Apple’s Siri, Amazon’s Alexa and Google’s Assistant. Inside university labs, the researchers have…

https://www.schneier.com/blog/archives/2018/05/sending_inaudib.html