Revealed: NSA uses four programs to collect data, two of which collect content

STELLARWIND was succeeded by four major lines of intelligence collection in the territorial United States, together capable of spanning the full range of modern telecommunications, according to the interviews and documents…

Two of the four collection programs, one each for telephony and the Internet, process trillions of “metadata” records for storage and analysis in systems called MAINWAY and MARINA, respectively. Metadata includes highly revealing information about the times, places, devices and participants in electronic communication, but not its contents. The bulk collection of telephone call records from Verizon Business Services, disclosed this month by the British newspaper the Guardian, is one source of raw intelligence for MAINWAY.

The other two types of collection, which operate on a much smaller scale, are aimed at content. One of them intercepts telephone calls and routes the spoken words to a system called ­NUCLEON.

For Internet content, the most important source collection is the PRISM project reported on June 6 by The Washington Post and the Guardian. It draws from data held by Google, Yahoo, Microsoft and other Silicon Valley giants, collectively the richest depositories of personal information in history.