A composite group of security experts from Boston, Shanghai, and South Florida has released a detailed report containing information on a new attack vector named WindTalker.
The essence of the research is that we interact with the touch screen when working with a mobile gadget and as a result some distortions of Wi-Fi signals are caused, provided that you are connected to the Internet. While reversing such signals, an attacker can learn what the customer thumb on the phone. Malware hotspot can be installed in a café, for example, which makes it possible for an adversary to collect all the distorted signals. In addition, with the help of a built-in WindTalker sniffer adversaries are able to say when a user fills in this or that data through his/her smartphone. The more data the sniffer collects, the more precise the metadata becomes.
This is obviously one of the multiple examples of attacks committed through public connections. Therefore, professionals in the sphere of cyber security insist on VPNs for Wi-Fi usage, as this is the most reliable way to avoid all the risks persecuting customers everywhere.