This app's 'travel mode' could keep your data safe from border guards

Over the course of the past few years, international travel has taken on an extra level of invasiveness as U.S. officials demand travelers unlock phones or hand over social media passwords in order to enter the country. Many travelers, even U.S. citizens, feel compelled to comply with these requests — sadly accepting that a forfeit of privacy is a prerequisite to return home. 

But it doesn't have to be that way. A new tool proposes to put a limit on just what border guards will be able to access during a search.