What was the primary Allied intelligence code word designating high-level decrypts of German military radio communications encoded by the Enigma and Lorenz machines?
Answer and explanation
Correct answer: C. Ultra
- Step 1: Decrypts produced by codebreakers at Bletchley Park were classified as 'Top Secret Ultra', a security classification considered above Top Secret.
- Step 2: Strict security measures were enforced to conceal the source of Ultra intelligence from German high command, ensuring German signal corps continued to trust Enigma ciphers until the final days of the war.
Answer
Ultra
Why not the others: 'Magic' Magic was the cryptonym for US decryption of Japanese diplomatic and military ciphers, notably the Purple machine; 'Overlord' Overlord was the operational military codename for the Allied invasion of northwest Europe at Normandy; 'Manhattan' Manhattan was the project codename for the development of atomic weapons in the United States.
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