Wow!! Carefully with the internet of things!!!

Nowadays Voice-commands with audio feedback are becoming a more common user interface for cellphones and digital "personal assistants" like Google Home and Amazon's Echo. Many of these devices are always on, listening for a wake-up word or command.

And guess what, this characteristic is so vulnerable. A team of researchers from Zhejiang University in China discovered that it is possible to translate vocal commands into ultrasonic frequencies that are inaudible to people but perfectly decipherable by the personal assistants. They call the hack "DolphinAttack". The group was able to generate not only ultrasonic wake-up commands like "OK, Google" and "Hey Siri", but follow-up commands like ordering the device the place a call to a certain phone number, open a website or even perform home-automation tasks like unlocking the front door!!!