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Method of encrypting alphabetic text by using a series of interwoven Caesar ciphers based on the letters of a keyword. Though the 'chiffre indéchiffrable' is easy to understand and implement, for three centuries it resisted all attempts to break it.
A program which performs a frequency analysis on a sample of English text and attempts a cipher-attack on polyalphabetic substitution ciphers using 2 famous methods - Kasiski's and Friedman's.