Edward Snowden Documents: NSA Tracking Cell Phones Worldwide

(Video: Soltani explains how the NSA uses cellphone tracking to find and ‘develop’ targets)

The NSA does not target Americans’ location data by design, but the agency acquires a substantial amount of information on the whereabouts of domestic cellphones “incidentally,” a legal term that connotes a foreseeable but not deliberate result.One senior collection manager, speaking on condition of anonymity but with permission from the NSA, said “we are getting vast volumes” of location data from around the world by tapping into the cables that connect mobile networks globally and that serve U.S. cellphones as well as foreign ones. Additionally, data are often collected from the tens of millions of Americans who travel abroad with their cellphones every year.

In scale, scope and potential impact on privacy, the efforts to collect and analyze location data may be unsurpassed among the NSA surveillance programs that have been disclosed since June. Analysts can find cellphones anywhere in the world, retrace their movements and expose hidden relationships among individuals using them.

(Graphic: How the NSA is tracking people right now)

U.S. officials said the programs that collect and analyze location data are lawful and intended strictly to develop intelligence about foreign targets.

Robert Litt, general counsel for the Office of the Director of National Intelligence, which oversees the NSA, said “there is no element of the intelligence community that under any authority is intentionally collecting bulk cellphone location information about cellphones in the United States.”

The NSA has no reason to suspect that the movements of the overwhelming majority of cellphone users would be relevant to national security. Rather, it collects locations in bulk because its most powerful analytic tools — known collectively as CO-TRAVELER — allow it to look for unknown associates of known intelligence targets by tracking people whose movements intersect.

Still, location data, especially when aggregated over time, is widely regarded among privacy advocates as uniquely sensitive. Sophisticated mathematical techniques enable NSA analysts to map cellphone owners’ relationships by correlating their patterns of movement over time with thousands or millions of other phone users who cross their paths. Cellphones broadcast their locations even when they are not being used to place a call or send a text.

CO-TRAVELER and related tools require the methodical collection and storage of location data on what amounts to a planetary scale. The government is tracking people from afar into confidential business meetings or personal visits to medical facilities, hotel rooms, private homes and other traditionally protected spaces.

The NSA cannot know in advance which tiny fraction of 1 percent of the records it may need, so it collects and keeps as many as it can — 27 terabytes, by one account, or more than double the text content of the Library of Congress’s print collection.

The location programs have brought in such volumes of information, according to a May 2012 internal NSA briefing, that they are “outpacing our ability to ingest, process and store” data. In the ensuing year and a half, the NSA has been transitioning to a processing system that provided it with greater capacity.

The possibility that the intelligence community has been collecting location data, particularly of Americans, has long concerned privacy advocates and some lawmakers. Three Democratic senators — Ron Wyden (Ore.), Mark Udall (Colo.) and Barbara Mikulski (Md.) — have introduced an amendment to the 2014 defense spending bill that would require U.S. intelligence agencies to say whether they have ever collected or made plans to collect location data for “a large number of United States persons with no known connection to suspicious activity.”

NSA Director Keith Alexander disclosed in Senate testimony in October that the NSA had run a pilot project in 2010 and 2011 to collect “samples” of U.S. cellphone location data. The data collected were never available for intelligence analysis purposes, and the project was discontinued because it had no “operational value,” he said.

Alexander allowed that a broader collection of such data “may be something that is a future requirement for the country, but it is not right now.”

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