LEAVE YOUR CELL PHONE AT HOME

Resnick: What should we know about cell phones? It’s hard to imagine going to a protest without one. But like all networked technologies, surely they are double-edged?
Appelbaum: Cell phones are tracking devices that make phone calls. It’s sad, but it’s true. Which means software solutions don’t always matter. You can have a secure set of tools on your phone, but it doesn’t change the fact that your phone tracks everywhere you go. And the police can potentially push updates onto your phone that backdoor it and allow it to be turned into a microphone remotely, and do other stuff like that. The police can identify everybody at a protest by bringing in a device called an IMSI catcher. It’s a fake cell phone tower that can be built for 1500 bucks. And once nearby, everybody’s cell phones will automatically jump onto the tower, and if the phone’s unique identifier is exposed, all the police have to do is go to the phone company and ask for their information.
Resnick: So phones are tracking devices. They can also be used for surreptitious recording. Would taking the battery out disable this capability?
Appelbaum: Maybe. But iPhones, for instance, don’t have a removable battery; they power off via the power button. So if I wrote a backdoor for the iPhone, it would play an animation that looked just like a black screen. And then when you pressed the button to turn it back on it would pretend to boot. Just play two videos.
Resnick: And how easy is it to create something like to that?
Appelbaum: There are weaponized toolkits sold by companies like FinFisher that enable breaking into BlackBerries, Android phones, iPhones, Symbian devices and other platforms. And with a single click, say, the police can own a person, and take over her phone.

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