Agnes Meyer Driscoll
“Miss Aggie” helped build American naval cryptanalysis through codebreaking and the training of later analysts.
Codebreaker Biography
Agnes Meyer Driscoll
Agnes Meyer Driscoll joined the Naval Reserve in 1918 and later worked as a civilian cryptanalyst. Her career included a short period at the Hebern company, so it was not uninterrupted Navy service. She contributed to attacks on Japanese naval codebooks and the M-1 machine. In 1940 she made early progress on JN-25, then moved to work on German naval Enigma; the unsuccessful wartime effort was not a three-year JN-25 assignment. She retired in 1959.
Why This Person Matters
Driscoll was an important early naval cryptanalyst and mentor, including to Joseph Rochefort. Her work belongs to a collective institutional history, not a claim that every Pacific codebreaking success was hers. The NSA biography distinguishes her Japanese-code achievements from her later German naval Enigma work.
Driscoll worked on the Japanese Navy’s Red Book and Blue Book systems in the interwar period. Codebook recovery, traffic analysis, and attacks on superencipherment were different parts of this work. Exact entry counts and a single uniform attack procedure should not be inferred from the color names alone; the declassified naval history linked below describes the successive systems.
The NSA credits Driscoll with leading the 1935 attack on the Japanese M-1, called ORANGE by American analysts. This demonstrated her ability to attack machine-generated traffic. The public biographical record cited here does not justify the previously asserted rotor wiring reconstruction, bribery anecdote, or a claim that Rowlett simply reused her method against PURPLE.
Driscoll trained and collaborated with Navy analysts whose later work supported American signals intelligence. Teaching mattered alongside individual solutions: analysts needed methods for organizing intercepted traffic, testing hypotheses, and recovering code values. This contribution does not require claiming that no cryptanalytic curriculum existed elsewhere.
- National Cryptologic Foundation — Agnes Meyer Driscoll ↗ (death 16 September 1971; NSA/CSS Cryptologic Hall of Honor, 2000)
- Naval History and Heritage Command — “Agnes Meyer Driscoll: The First Lady of Naval Cryptology” ↗
- Holtwick, Jack S. Pearl Harbor Revisited: U.S. Navy Communications Intelligence, 1924–1941 (NSA Center for Cryptologic History) — the declassified internal history of OP-20-G in which Driscoll’s Red Book, Blue Book and M-1 work is documented ↗
- Carlson, Elliot. Joe Rochefort’s War (Naval Institute Press, 2011) — Driscoll as Rochefort’s instructor ↗
- Indiana University, Center of Excellence for Women & Technology — Agnes Driscoll profile ↗
- Wikipedia — Agnes Meyer Driscoll (encyclopaedia overview) ↗
Removed as unsourced: a claim that the first serious historical account of her work appeared in 1995. No work of that year appears in any source consulted, and the NCF lists the Kevin Wade Johnson studies undated. The documented recognition record has been used instead. An FDR anecdote was removed from this page in the same pass.
| Born | July 24, 1889, Geneseo, Illinois |
| Died | September 16, 1971, Washington, D.C. |
| Education | Ohio State — BA Maths, Physics, Languages |
| Service | OP-20-G / NSA, 1920–1959 |
| Key breaks | Red Book (1926), Blue Book (1930), M-1 (1935) |
| Notable student | Joe Rochefort (Midway) |
| Award | Navy Meritorious Civilian Service |