#013 · Women in TechLegendaryLocked in

Joan Clarke

Cryptanalyst, Hut 8

Breaking naval Enigma at Bletchley Park

Rating

88Impact score
Technical depth94
Went first88
Openness60
Influence86
FromUK
Era1940-1977

Domains

CryptanalysisEnigmaSignals intelligence

Scouting report

One of the very few women doing cryptanalytic rather than clerical work at Bletchley Park, in the Hut 8 team attacking naval Enigma, and a practitioner of Banburismus. She was initially classified as a linguist because the pay grades had no category for a woman cryptanalyst. The work stayed secret for decades, so the record of it is thinner than it should be.

Curator’s note

The openness score is low because the Official Secrets Act made it so.

Sources