The receiver of the message can, by the same process, retranslate it The second will contain only 'h m k b x e b p x p m y l l y r x i i q t o l t f g z z v'. H m k b x e b p x p m y l l y r x i i q t o l t f g z z v M e e t m e o n t u e s d a y e v e n i n g a t s e v e n V i g i l a n c e v i g i l a n c e v i g i l a n c e v i Tuesday evening at seven', the first paper will read as follows. Impossible for anyone, ignorant of the key-word, to decipher the message,įor example, let the key-word be vigilance, and the message 'meet me on The message, the symbols for which should be written underneath: thenĬopy out the symbols only, and destroy the first paper.
Will indicate which column is to be used in translating each letter of Repeating it as often as may be necessary: the letters of the key-word In sending a message, write the key-word over it, letter for letter, This may be called the 'key-word', or 'key-sentence',Īnd should be carried in the memory only. To use the table, some word or sentence should be agreed on by twoĬorrespondents. Represented in the B column, A is represented by B, B by C, and so on. "The Alphabet-Cipher", Lewis Carroll, 1868 ABCDEFGHIJKLMNOPQRSTUVWXYZĮach column of this table forms a dictionary of symbols representing theĪlphabet: thus, in the A column, the symbol is the same as the letter
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While Carroll calls this cipher "unbreakable," Kasiski had already published in 1863 a volume describing how to break such ciphers and Charles Babbage had secretly found ways to break polyalphabetic ciphers in the previous decade during the Crimean War. It describes what is known as a Vigenère cipher, a well-known scheme in cryptography.
Lewis Carroll published " The Alphabet-Cipher" in 1868, possibly in a children's magazine.
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