The Ultra secret

by Frederick William Winterbotham

1975 286 pages eng

English Personal narratives Cryptography Secret service World War, 1939-1945

Operation Ultra was designed to intercept & decode German signals sent using Enigma, the top-secret German cypher machine. F.W. Winterbotham, was the man responsible for the organization, distribution & security of Ultra. This is his personal account of the operation.

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