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The Bellaso cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of [polyalphabetic substitution] (https://en.wikipedia.org/wiki/Polyalphabetic_cipher).
CHIPER is an interactive web platform for learning classical cryptographic techniques, featuring demos of algorithms like Monoalphabetic, Hill, Playfair, and more
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.