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03/18/2014

Barton Gellman/Ashkan Soltani/WashingtonPost:

The National Security Agency has built a surveillance system capable of recording "100 percent" of a foreign country's telephone calls, enabling the agency to rewind and review conversations as long as a month after they take place, according to people with direct knowledge of the effort and documents supplied by former contractor Edward Snowden.

A senior manager for the program compares it to a time machine — one that can replay the voices from any call without requiring that a person be identified in advance for surveillance.

The voice interception program, called MYSTIC, began in 2009. Its RETRO tool, short for "retrospective retrieval," and related projects reached full capacity against the first target nation in 2011. Planning documents two years later anticipated similar operations elsewhere.

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In the initial deployment, collection systems are recording "every single" conversation nationwide, storing billions of them in a 30-day rolling buffer that clears the oldest calls as new ones arrive, according to a classified summary.

The call buffer opens a door "into the past," the summary says, enabling users to "retrieve audio of interest that was not tasked at the time of the original call." Analysts listen to only a fraction of 1 percent of the calls, but the absolute numbers are high. Each month, they send millions of voice clippings, or "cuts," for processing and long-term storage.

At the request of U.S. officials, The Washington Post is withholding details that could be used to identify the country where the system is being employed or other countries where its use was envisioned.

No other NSA program disclosed to date has swallowed a nation's telephone network whole.

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Some of the documents provided by Snowden suggest that high-volume eavesdropping may soon be extended to other countries, if it has not been already. The RETRO tool was built three years ago as a "unique one-off capability," but last year's secret intelligence budget named five more countries for which the MYSTIC program provides "comprehensive metadata access and content," with a sixth expected to be in place by last October.

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The budget did not say whether the NSA now records calls in quantity in those countries or expects to do so. A separate document placed a high priority on planning "for MYSTIC accesses against projected new mission requirements," including "voice."

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The emblem of the MYSTIC program depicts a cartoon wizard with a telephone-headed staff. Among the agency's bulk collection programs disclosed over the past year, its focus on the spoken word is unique. Most of the programs have involved the bulk collection of metadata — which does not include call content — or text, such as e-mail address books.

Telephone calls are often thought to be more ephemeral and less suited than text for processing, storage and search. And there are indications that the call-recording program has been hindered by the NSA's limited capacity to store and transmit bulky voice files.

In the first year of its deployment, a program officer wrote that the project "has long since reached the point where it was collecting and sending home far more than the bandwidth could handle."

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Based on RETRO's internal reviews, the NSA has a strong motive to deploy it elsewhere. In the documents and in interviews, U.S. officials said RETRO is uniquely valuable when an analyst uncovers a new name or telephone number of interest.

With up to 30 days of recorded conversations in hand, the NSA can pull an instant history of the subject's movements, associates and plans. Some other U.S. intelligence agencies also have access to RETRO.

Highly classified briefings cite examples in which the tool offered high-stakes intelligence that would not have existed under traditional surveillance programs in which subjects are identified for targeting in advance. In contrast with most of the government's public claims about the value of controversial programs, the briefings supply names, dates, locations and fragments of intercepted calls in convincing detail.

Present and former U.S. officials, speaking on the condition of anonymity to provide context for a classified program, acknowledged that large numbers of conversations involving Americans would be gathered from the country where RETRO operates.

The NSA does not attempt to filter out their calls, defining them as communications "acquired incidentally as a result of collection directed against appropriate foreign intelligence targets."

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Under the NSA's internal "minimization rules," those intercepted communications "may be retained and processed" and included in intelligence reports. The agency generally removes the names of U.S. callers, but there are several broadly worded exceptions.

An independent group tasked by the White House to review U.S. surveillance policies recommended that incidentally collected U.S. calls and e-mails — including those obtained overseas — should nearly always "be purged upon detection." Obama did not accept that recommendation.

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RETRO and MYSTIC are carried out under Executive Order 12333, the traditional grant of presidential authority to intelligence agencies for operations outside the United States.