DODGSON, Charles Lutwidge (''Lewis Carroll''). The Alphabet-Cipher. [London, ca 1868].
DODGSON, Charles Lutwidge ("Lewis Carroll"). The Alphabet-Cipher. [London, ca 1868].
Broadsheet on card stock (180 x 123 mm). The table of letters printed on one side and the Explanation on the other.
This cipher game was invented by Lewis Carroll in 1868. In order to decode a message, two players agree on a keyword and write it letter for letter over the message to be sent. The table of letters, provided on the first side of the card, is also needed. It is a Vigenère cipher, a well-known scheme in cryptography. Williams-Madan-Green-Crutch 63; Parrish Catalogue, p.103.
[With:] DODGSON. Feeding the Mind. London: Chatto & Windus, 1907. 8o. Original wrappers. A short lecture delivered in Derbyshire in October 1884 comparing the feeding of the mind with the feeding of the body. Williams-Madan-Green-Crutch 291. (2)