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The Invisible Cryptologists: African-Americans, WWII to 1956 by Jeannette Williams

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Chapter 3. 1944–1946: The Commercial Code Unit

yeqyx ipeoa ipeco caozr ivmzi oatab

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(Pineapple must be packed very carefully. Mark outside of packages plainly, with gross and net weights. Customers will pay for cost of transshipment. Telegraph us at time shipment is made.)

orutl yeqyx oczom

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(In accordance with your telegram, pineapple will be shipped immediately.) – English texts and commercial code equivalents from Acme Commodity and Phrase Code, New York, 1923

Very quickly after the introduction of the American Morse code for telegraphic messages, it was recognized that this new mode of communicating seriously threatened privacy. Inserted between the originator and intended recipient of the information ...

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