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A '''Cipher Disk''' is a cryptological device that can be used for enciphering and deciphering messages. The development of the cipher disk is attributed to [[Leon Battista Alberti]] in the 15th Century. Its development is considered a milestone in [[cryptology]].
The cipher disk has two scales, one with an ordered alphabet, or plaintext scale, the other with a scrambled or cipher alphabet. The cipher disk can be used for either simple (monalphabetic) substitution ciphers, where the same cipher character represents the same original character (or plaintext character) throughout a message, or for polyalphabetic ciphers, where a cipher may represent different plaintext characters, using some agreed-upon scheme between the sender and the receiver.
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* The Code Breakers, by David Kahn (New York, Scribener 1996, ISBN 0-684-83130-9)
[[Category:Cryptographic hardware]]
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