largely in Dodgson's life and, over the following years, greatly influence his writing career. Dodgson became close friends with Liddell's wife, Lorina, and their children, particularly the three sisters: Lorina, Edith and Alice Liddell. He was for many years widely assumed to have derived his own "Alice" from Alice Liddell. This was given some apparent substance by the fact the acrostic poem at the end of Through the Looking Glass spells out her name, and that there are many superficial references to her hidden in the text of both books. It has been pointed out that Dodgson himself repeatedly denied in later life that his "little heroine" was based on any real child, and frequently dedicated his works to girls of his acquaintance, adding their names in acrostic poems at the beginning of the text
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. Friedman broke in evolving the principle of the index of coincidence. A
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