Sending Inaudible Commands to Voice Assistants. In the wrong hands, the technology could be used to unlock doors, wire money or buy stuff online ­-- simply with music playing over the radio

In Summary :

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 been able to secretly activate the artificial intelligence systems on smartphones and smart speakers, making them dial phone numbers or open websites. In the wrong hands, the technology could be used to unlock doors, wire money or buy stuff online ­-- simply with music playing over the radio. [...]

kindly refer the following link as follow up :
https://ift.tt/2jZvHtU