Hackers Can Silently Control Siri, Alexa & Other Voice Assistants Using Ultrasound | thehakersnews

A team of security researchers from China's Zhejiang University have discovered a clever way of activating your voice recognition systems without speaking a word by exploiting a security vulnerability that is apparently common across all major voice assistants.

Dubbed **DolphinAttack**, the attack technique works by feeding the AI assistants commands in ultrasonic frequencies, which are too high for humans to hear but are perfectly audible to the microphones on your smart devices.