In an engineering paper, bunnie Huang and Ed Snowden describe a malware-resistant hardware Iphone privacy overlay

In July 2016, Andrew "bunnie" Huang and Edward Snowden presented their research on journalist-friendly mobile surveillance resistance at the first MIT Media Lab Forbidden Research conference; a little over a year later, they have published an extensive scholarly paper laying out the problems of detecting and interdicting malware in a mobile device, and presenting a gorgeously engineered hardware overlay that can be installed in an Iphone to physically monitor the networking components and report on their activity via a screen on a slim external case. (more")