NSA: The finder and keeper of countless US secrets

An email, a telephone call or even the murmur of a conversation captured by the vibration of a window they're all part of the data that can be swept up by the sophisticated machinery of the National Security Agency.
Its job is to use the world's most cutting edge supercomputers and arguably the largest database storage sites to crunch and sift through immense amounts of data.
The information analyzed might be stolen from a foreign official's laptop by a CIA officer overseas, intercepted by a Navy spy plane flying off the Chinese coast, or, as Americans found out this past week, gathered from US phone records.

Code-breakers at the Fort Meade, Maryland-based NSA use software to search for keywords in the emails or patterns in the phone numbers that might link known terrorist targets with possible new suspects.
They farm out that information to the 16 US intelligence agencies and to law enforcement, depending on who has the right to access which type of information, acting as gatekeeper, and they say, guardian of the nation's civil liberties as well as its security.
The super-secret agency is under the spotlight after last week's revelations of two surveillance programs. One involves the sweeping collection of hundreds of millions of phone records of US customers.

The second collects the audio, video, email, photographic and Internet search usage of foreign nationals overseas and probably some Americans in the process who use major Internet companies such as Microsoft, Google, Apple, and Yahoo.

The NSA was founded in 1952. Only years later was the NSA publicly acknowledged, which explains its nickname, "No Such Agency."
According to its website, NSA is not allowed to spy on Americans. It is supposed to use its formidable technology to "gather information that America's adversaries wish to keep secret," and to "protect America's vital national security information and systems from theft or damage by others," as well as enabling "network warfare, a military operation," that includes offensive cyberoperations against US adversaries.

The agency also includes the Central Security Service, the military arm of code-breakers who work jointly with the agency.
The two services have their headquarters on a compound that's technically part of Fort Meade, though it's slightly set apart from the 5,000-acre (2,000-hectare) Army base.
Visible from a main highway, the tightly guarded compound requires the highest of clearances to enter and is equipped with electronic means to ward off an attack by hackers.
Other NSA facilities in Georgia, Texas, Colorado and Hawaii duplicate much of the headquarters' brain and computer power in case a terrorist attack takes out the main location, though each one focuses on a different part of the globe.

A new million-square-foot (90,000-square-meter) storage facility in Salt Lake City will give the agency untold additional capacity to store the massive amounts of data it collects, as well as adding to its analytical capability.