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The Combined Cipher Machine 1940's-1950's
Cipher machines were extensively used by both the Axis and the Allies during WWII. The Germans had the Enigma , the Lorenz SZ 40/42 and t...
The need for a combined US-UK cipher system was apparent by 1941 so the British gave the Americans their Naval Cypher No 3 (a codebook enciphered with additive tables) for use in the N. Atlantic convoy operations. Thus, nothing substantial or of long-term benefit would be gained by modification of the CCM along the lines of the Navy's or the Army's proposals, which involve mere changes in rotor motion, with or without reversed stepping ’. NATO Archives Online: S.G. 7/40 ‘Standing group decision on S.G. 7/40 – A report by the Communications-Electronics coordination Section on Provision of a general high grade cyher system for North Atlantic treaty organization powers’.
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