The National Security Agency/Central Security Service (NSA/CSS) leads the U.S. Government in cryptology that encompasses both signals intelligence (SIGINT) and information assurance (now referred to as cybersecurity) products and services, and enables computer network operations (CNO) in order to gain a decision advantage for the Nation and our allies under all circumstances.

The NSA was formed, November 4, 1952 (Declassified document that creates the NSA) This previous top secret memo from the secretary of defense changed the name of the Armed Forces Security Agency to the National Security Agency (NSA). It also proceeded to give responsibilities to the new NSA.

NSA has posted a timeline of major items and documents from then to 2012: https://www.nsa.gov/News-Features/Declassified-Documents/NSA-60th-Timeline/