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r ? 1. Example, ? = {A,, Z}, l = 2, k = XY: P L A I N T E X T. X Y P L A I N T E. Feb 23, 2020 · Dec 31, 2015 ·The Autokey Cipher is one such example. In general, the term autokey refers to any cipher where the key is based on the original plaintext. In its simplest form, Mar 9, 2020 · Javascript Example §. This is an JavaScript implementation of the Autokey cipher, enter your plaintext in the text area provided. Plaintext. defend the east wall An autokey cipher is a cipher that incorporates the message (the plaintext) into the key. The key If, for example, the keyword is "QUEENLY" and the message is "ATTACK AT DAWN", the key would be "QUEENLYATTACKATDAWN". Plaintext: The ciphertext message would therefore be "QNXEPVYTWTWP". Cryptanalysis. Using an example message "meet at the fountain Extending Keys. The Vigenere cipher is an example of a periodic cipher. For the Vigenere cipher, the period comes from repetition of the keyword; the cipher