Agnes Meyer Driscoll: The First Lady of Naval Cryptology
Agnes Meyer Driscoll (24 July 1889 – 16 September 1971) was an American cryptanalyst who served during both World War I and World War II. She was known as “the first lady of naval cryptology” for her pioneering work breaking Japanese and German military codes.
Early Life and Education
Driscoll was born Agnes May Meyer in Geneseo, Illinois, in 1889. Her family moved to Westerville, Ohio, in 1895 when her father, Gustav Meyer, took a position teaching music at Otterbein College. In 1909, her father donated the family home to the Anti-Saloon League, which had relocated its headquarters to Westerville.
She attended Otterbein College from 1907 to 1909, then earned a Bachelor of Arts degree from Ohio State University in 1911, majoring in mathematics and physics while studying foreign languages, statistics, and music. She became fluent in English, French, German, Latin, and Japanese. After graduation, she moved to Amarillo, Texas, where she worked as director of music at a military academy and later as chair of the mathematics department at the local high school.
Career and Achievements
On June 22, 1918, Driscoll enlisted in the United States Navy as a chief yeoman, one of the first women to enlist after America entered World War I. She was assigned to the Code and Signal section of the Director of Naval Communications. After the war ended, she transitioned to civilian work at the same post, remaining a leading cryptanalyst for the Navy until 1949, with the exception of a two-year break when she worked for a private firm.
In 1920, while employed by the Navy, Driscoll studied at the Riverbank Laboratories in Geneva, Illinois, where she worked alongside William F. Friedman and Elizebeth Smith Friedman. She also worked at the American Black Chamber, the first U.S. peacetime code-breaking agency, which focused on breaking diplomatic codes.
Early in her career with the Code and Signal section, Driscoll co-developed the “Communications Machine,” one of the U.S. Navy’s cipher machines that became a standard enciphering device throughout the 1920s. Congress awarded her $15,000 for this work, which she shared with the widow of co-inventor William Greshem. In 1923, she left the Navy to test Edward Hebern’s rotor-driven cipher machine but returned in spring 1924 after determining it did not provide adequate security.
In 1926, working with Lieutenant Joseph Rochefort, Driscoll broke the Japanese Navy’s Red Book Code after three years of effort. She also contributed to breaking the Blue Book Code in 1930. In early 1935, she led the attack on the Japanese M-1 cipher machine, used to encrypt messages of Japanese naval attaches worldwide.
In 1939, Driscoll made significant progress on JN-25, the Japanese fleet’s operational code. She successfully solved the cipher component of the “5-num” system, allowing the Navy to read some standard format messages. This foundational work later enabled the Navy to provide advance warning of the Japanese attack on Midway Atoll, though Driscoll herself was transferred in October 1940 to work on breaking the German naval Enigma cipher and did not participate in the later exploitation of JN-25.
Her work on the German Enigma proved less successful. After nearly two years, Driscoll’s team made little progress using a catalog approach. Her reluctance to employ machine support or mathematical methods, combined with her refusal of assistance from British code breakers at Bletchley Park, contributed to the effort’s limited results. This approach was eventually superseded by US-UK cryptologic exchanges in 1942–43.
In 1943, Driscoll worked on breaking the Japanese cipher Coral, though her contribution to this effort was reportedly minimal. She mentored several naval cryptographers, including Joseph Rochefort, Thomas Dyer, Edwin T. Layton, and Joseph Wenger. In 1945, she worked on attacking Russian ciphers. She joined the Armed Forces Security Agency in 1949 and the National Security Agency in 1952, continuing her cryptanalytic work until her retirement.
Notable Events and Milestones
Driscoll’s career spanned the evolution of cryptanalysis from manual systems to machine-based methods. Her 1926 breakthrough on the Red Book Code, achieved with Rochefort after three years of work, demonstrated her capability for sustained, complex problem-solving. Her 1939 progress on JN-25 proved strategically significant, as the foundation she laid enabled later intelligence successes in the Pacific War.
In August 1924, she married Michael Driscoll, a Washington, D.C. lawyer. She was married in 1924 and maintained her professional identity and career throughout her marriage.
Awards and Honors
Congress awarded Driscoll $15,000 in recognition of her co-development of the Communications Machine, which she shared with the widow of co-inventor William Greshem. Her reputation as “the first lady of naval cryptology” reflected her pioneering status and sustained contributions to American cryptanalysis across two world wars.
Additional Resources
Agnes Meyer Driscoll’s contributions to naval cryptology and her role in breaking Japanese military codes remain significant to the history of American intelligence. Readers seeking more detailed information about her life, her specific cryptanalytic methods, and her influence on the development of American cryptology can consult Wikipedia and other biographical archives dedicated to World War II history and the history of cryptography.
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