TheCodeBreakers
repeated-key transposition and published it in his Cryptographic
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,
annaabi.ee 
