

Joan Clarke
Cryptanalyst, Hut 8
Breaking naval Enigma at Bletchley Park
Rating
88Impact score
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
- 01Joan Clarke en.wikipedia.org
- 02Bletchley Park bletchleypark.org.uk