Manual for the Solution of Military Ciphers (1916)
by Parker Hitt
Fixed Cipher Alphabet⏎ PCJVRQZBAODFSUTMXIYHLGENPCJVRQZBAODFSUTMXIYHLGEN⏎ ABCDEFGHIJLMNOPQRSTUVXYZ⏎ Sliding Plain Text Alphabet⏎ A-B Cipher⏎ If I equals O then A equals R⏎ I R C⏎ H D X⏎ A E R⏎ H N B⏎ Y O Q⏎ Clearly there is nothing here and the assumed words, if they occur, are in the middle of the message. We may jump to the combination PEGQGV at once since the preceding letters do not make ORDENO QUE. We try this without result and proceed to EGQGVJ, GQGVJJ, QGVJJE, GVJJEE, VJJEEE, JJEEEH, JEEEHO, EEEHOB, EEHOBG, EHOBGV, HOBGVG, OBGVGJ, BGVGJC, GVGJCA, VGJCAG, all without result. This work requires less time than might be imagined and is the kind of work which can be divided among a number of operators. Now let us come to the next combination GJCAGX. We add the next three letters, AES, against QUE.🏁
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Fixed Cipher Alphabet⏎ PCJVRQZBAODFSUTMXIYHLGENPCJVRQZBAODFSUTMXIYHLGEN⏎ ABCDEFGHIJLMNOPQRSTUVXYZ⏎ Sliding Plain Text Alphabet⏎ A-B Cipher⏎ If I equals O then A equals R⏎ I R C⏎ H D X⏎ A E R⏎ H N B⏎ Y O Q⏎ Clearly there is nothing here and the assumed words, if they occur, are in the middle of the message. We may jump to the combination PEGQGV at once since the preceding letters do not make ORDENO QUE. We try this without result and proceed to EGQGVJ, GQGVJJ, QGVJJE, GVJJEE, VJJEEE, JJEEEH, JEEEHO, EEEHOB, EEHOBG, EHOBGV, HOBGVG, OBGVGJ, BGVGJC, GVGJCA, VGJCAG, all without result. This work requires less time than might be imagined and is the kind of work which can be divided among a number of operators. Now let us come to the next combination GJCAGX. We add the next three letters, AES, against QUE.🏁