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indechiftruble. Collon, a Belgian Army officer, proposed a number of fractionating systems. One Rozier marched his plaintext letters through the interior of a Vigenere tableau in a dizzily twisting path in an attempt. to lose the cryptanalyst. The so-called Phillips cipher enciphers five letters monoalphabetically in a 5 X 5 square, then shifts the lines of the square and repeats the process. The Amsco transposition cipher acepts both single letters and pairs as its plaintext elements. A. de Grandpre filled a 10 X 10 square with ten 10-letter words whose first letters form a mnemonic acrostic, then ranged coordinates on the outside and used these to encipher; the use of plaintext words inside provides homophones in approximately the proportion required to disguise the frequencies of normal plaintext. A French major, Louis-Marie-Jules Schneider, concocted an enormously complex polyalpha-betic whose alphabets were generated one from the other; this was one of the systems William F.
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