NSA intelligence-gathering programs have prevented 54 terrorist attacks, 13 of them in the U.S., says Director Gen. Keith Alexander.
General Keith Alexander, head of the NSA, gave the keynote speech at the Black Hat security conference in Las Vegas where he addressed national security and detailed what information the NSA collects and how it analyzes the data.
The Obama administration released formerly classified documents outlining a once-secret program of the National Security Agency that is collecting records of all domestic phone calls in the United States, as top officials testified before the Senate Judiciary Committee. The documents include an April ruling by the Foreign Intelligence Surveillance Court that supported a secondary order ? leaked by the former N.S.A. contractor Edward Snowden