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Program that encrypts plaintext and (attempts) to decrypt ciphertexts, encrypted via a mono-alphabetic substitution cipher. Replaces letters based on frequency / n-gram analysis. Tried to incorporate hill-climbing algorithm by measuring the fitness of resulting texts to find the best key.
This is an symmetric encryption algorithm. It is a more glorified version of a substitution cipher. However, some substitutions are added that do not correspond to a letter to try and confuse anyone trying to break the cipher