Voice assistants can be hacked by commanding them with inaudible ultrasonic speech

In DolphinAttack: Inaudible Voice Commands, researchers from Zhejiang University demonstrate an attack on popular voice assistants in laptops and mobile devices from Apple, Google, Amazon, Microsoft, Samsung, and Huawei: by commanding these assistants using speech that has been shifted to ultrasonic ranges, they are able to hijack devices in public places without their owners' knowledge. Read the rest “Voice assistants can be hacked by commanding them with inaudible ultrasonic speech”