Abstract
Charles L. Dodgson, better known as Lewis Carroll, invented several polyal-phabetic ciphers by 1868. The two that he published are put into historical perspective in this paper. His Alphabet Cipher produces a Vigenere enciphered text, while his Telegraph Cipher is equivalent to a Beaufort cipher. In constructing the Telegraph Cipher, Dodgson used two sliding alphabets, similar to the St. Cyr slide invented by Auguste Ker-ckhoff fifteen years later. A program is available to explore these ciphers and another, the Variant Beaufort.
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