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The Kasiski Examination is a cryptanalysis method used to break polyalphabetic substitution ciphers, particularly the Vigenère cipher, by identifying repeated sequences of letters to determine the key length. This technique exploits the periodic nature of the cipher to reveal weaknesses that can be further analyzed to recover the original plaintext.
The Vigenère Cipher is a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution, where a keyword is used to shift the letters of the plaintext. It was once considered unbreakable until the development of cryptanalysis techniques such as frequency analysis and the Kasiski examination revealed its vulnerabilities.
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