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Munitions Building, Washington D.C. December 15, 1943 Dear young cryptanalysts, Recently the Japanese changed the wiring of their Purple machine. We were able to reconstruct it but it took us a very long time. I ask you to find new, faster methods to be able to reconstruct the wiring if unfortunately it had to be changed again. To practice we have created a message in English using punctuation marks and numbers translated into words (for example, 3=three). It should also be noted that the words are separated by the letter Z. The subject of the message concerns the War of Independence from 1778 to 1780. You will be helped by the fact that the Japanese have not changed their indicator system. Here is the message key we used: motion: 321, Sixes: 4, Twenties: 9,11,20 and cipher mode. Good luck! Frank Byron Rowllet Message without the header: WTVZK GCBRK
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