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1921: W. Friedman appointed Chief Cryptanalyst for the Signal Corps

Saturday, November 16, 2019
1921: W. Friedman appointed Chief Cryptanalyst for the Signal Corps

16 Nov 1921: William Friedman appointed Chief Cryptanalyst for the Signal Corps in charge of the Code and Cipher Section. In the photo: The Signal Intelligence Service (SIS) was established in 1929 to control all Army cryptologic activity. In this photo are Friedman (center, standing) and the SIS staff in 1935. The Signal Corps Code and Ciphers Section was the predecessor to the SIS.

In November 1921, Friedman, who had served in a radio intelligence section during the War, was hired as the chief cryptographer for the Signal Corps. He was charged with code and cipher development for the Army, and to plan for wartime signals intelligence operations. However, the budget crises of post war cutbacks combined with the passage of a law in 1927 making radio communications intercept illegal in America, brought the code and cipher effort nearly to a halt. To save the effort from extinction, in April 1929, the Secretary of War directed "That the Signal Corps be charged with the duties pertaining to the solution of enemy codes and ciphers and the detection of secret inks in War, in addition to those duties with which they are now charged by the Army and to the interception of enemy radio and wire traffic in war." The War Department was, in effect, tasking its Signal Corps to break the law. Needless to say, the Signal Corps maintained the utmost secrecy regarding these efforts.

After the Black Chamber closed, all cryptographic work became the sole responsibility of the War Department, by both the Army and the Navy. In May 1929, all War Department operational functions pertaining to cryptography and cryptanalysis were brought together under the Army's Chief Signal Officer. Two months later, the Signals Intelligence Service (SIS) was officially organized with Mr. Friedman as its chief. He remained in this position until 1935 when an Army major was assigned as officer-in-charge.

In 1943, the SIS was redesignated the Signal Security Service and later the Signal Security Agency. Responsibility for the SSA was divided between the Military Intelligence Service (MIS) for operations, and the Signal Corps for administration. On 15 September 1945, the Signal Security Agency was reunited again under the Director of Military Intelligence as the Army Security Agency at Arlington Hall, Virginia.

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  • The NSA's Center for Cryptologic History published, "The Friedman Legacy: A Tribute to William and Elizebeth Friedman" which includes transcripts of the famed "Friedman Lectures."

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The NCMF directly supports the National Cryptologic Museum (NCM), the first public museum in the U.S. Intelligence Community. We think you will agree it is truly a "museum like no other."

Located adjacent to the National Security Agency (NSA) in Maryland, the NCM houses a priceless collection of artifacts that represent our Nation's history in code making and code breaking, as well as a world class library of cryptologic media. The NCMF acquires the best artifacts for the NCM and supports new educational and interactive exhibits.

The NCMF provides exceptional cryptologic programs throughout the year, encourages young minds to explore cryptology and innovation through valued awards, and hosts educational, cryptology-related exhibits at various community events.

As part of the Foundation's partnership with NSA to build the Cyber Center for Education and Innovation - Home of the National Cryptologic Museum (CCEI-NCM), the NCMF also serves as a leader in the field of cybersecurity - striving to provide the best in educational resources and programs.

The NCMF and NCM share a joint three-fold mission to Educate, Stimulate, and Commemorate. Learn more about our MISSION.