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"Floradora", also called Keyword, was a doubly enciphered diplomatic code used by the Germans during the Second World War. The Allies used tabulating equipment, created by IBM, to break the code over period of more than a year in 1941 and 1942.
- Budiansky, Stephen. Battle of wits: the complete story of codebreaking in World War II, p. 55. Simon and Schuster, 2000
- How the Allies broke the German Diplomatic cipher Floradora. Michael J. Cowan[permanent dead link]
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