When a smartphone user opens Angry Birds, the popular game application, and starts slinging birds at chortling green pigs, spy agencies have plotted how to lurk in the background to snatch data revealing the player's location, age, sex and other personal information, according to secret British intelligence documents.
In their globe-spanning surveillance for terrorism suspects and other targets, the National Security Agency and its British counterpart have been trying to exploit a basic byproduct of modern telecommunications: With each new generation of mobile phone technology, ever greater amounts of personal data pour onto networks where spies can pick it up.
According to dozens of previously undisclosed classified documents, among the most valuable of those unintended intelligence tools are so-called leaky apps that spew everything from users' smartphone identification codes to where they have been that day.
The N.S.A. and Britain's Government Communications Headquarters were working together on how to collect and store data from dozens of smartphone apps by 2007, according to the documents, provided by Edward J. Snowden, the former N.S.A. contractor. Since then, the agencies have traded recipes for grabbing location and planning data when a target uses Google Maps, and for vacuuming up address books, buddy lists, phone logs and the geographic data embedded in photos when someone sends a post to the mobile versions of Facebook, Flickr, LinkedIn, Twitter and other services.
The eavesdroppers' pursuit of mobile networks has been outlined in earlier reports, but the secret documents, shared by The New York Times, The Guardian and ProPublica, offer far more details of their ambitions for smartphones and the apps that run on them. The efforts were part of an initiative called "the mobile surge," according to a 2011 British document, an analogy to the troop surges in Iraq and Afghanistan. One N.S.A. analyst's enthusiasm was evident in the breathless title — "Golden Nugget!" — given to one slide for a top-secret 2010 talk describing iPhones and Android phones as rich resources, one document notes.
The scale and the specifics of the data haul are not clear. The documents show that the N.S.A. and the British agency routinely obtain information from certain apps, particularly some of those introduced earliest to cellphones. With some newer apps, including Angry Birds, the agencies have a similar capability, the documents show, but they do not make explicit whether the spies have put that into practice. Some personal data, developed in profiles by advertising companies, could be particularly sensitive: A secret 2012 British intelligence document says that spies can scrub smartphone apps that contain details like a user's "political alignment" and sexual orientation.
President Barack Obama announced new restrictions this month to better protect the privacy of ordinary Americans and foreigners from government surveillance, including limits on how the N.S.A. can view "metadata" of Americans' phone calls—the routing information, time stamps and other data associated with calls. But he did not address the avalanche of information that the intelligence agencies get from leaky apps and other smartphone functions.
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And while he expressed concern about advertising companies that collect information on people to send tailored ads to their mobile phones, he offered no hint that American spies routinely seize that data. Nothing in the secret reports indicates that the companies cooperate with the spy agencies to share the information; the topic is not addressed.