Edward Snowden designs phone case to show when data is being monitored

Snowden and co-designer Andrew 'Bunnie' Huang's 'introspection engine' knows when a cellular, Wi-Fi or Bluetooth connection is being used to share data

Edward Snowden has helped design a mobile phone case called the "introspection engine" that, he claims, will show when a smartphone is transmitting information that could be monitored.

Presenting via video link to event at the MIT Media Lab in Cambridge, Massachusetts, Snowden and co-designer Andrew "Bunnie" Huang showed how the device connects to a phone's different radio transmitters, showing its owner knows when a cellular, Wi-Fi or Bluetooth connection is being used to share or receive data.