How we know the NSA had access to internal Google and Yahoo cloud data

BY BARTON GELLMAN, ASHKAN SOLTANI, AND ANDREA PETERSON

November 4 at 3:03 pm

The Washington Post reported last Wednesday that the National Security Agency has been tapping into the private links that connect Google and Yahoo data centers around the world. Today we offer additional background, with new evidence from the source documents and interviews with confidential sources, demonstrating that the NSA accessed data traveling between those centers.
The background also helps explain the response of U.S. officials following the publication of the story.
The U.S. government declined repeated requests to discuss the story beginning eight days before it was published. Since publication it has made four responses.

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Continua qui: http://www.washingtonpost.com/blogs/the-switch/wp/2013/11/04/how-we-know-the-nsa-had-access-to-internal-google-and-yahoo-cloud-data/