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Autokey cipher
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{{short description|Classic polyalphabet encryption system}} [[Image:Vigenère square shading.svg|thumb|300px|right|A [[tabula recta]] for use with an autokey cipher]] An '''autokey cipher''' (also known as the '''autoclave cipher''') is a [[cipher]] that incorporates the message (the [[plaintext]]) into the [[key (cryptography)|key]]. The key is generated from the message in some automated fashion, sometimes by selecting certain letters from the text or, more commonly, by adding a short ''primer key'' to the front of the message. There are two forms of autokey cipher: ''key-autokey'' and ''text-autokey'' ciphers. A key-autokey cipher uses previous members of the [[keystream]] to determine the next element in the keystream. A text-autokey uses the previous message text to determine the next element in the keystream.
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