This online calculator tries to decode Vigenère cipher without knowing the key. It uses the index of coincidence technique.

This online calculator tries to decode substitution cipher without knowing the key. It uses genetic algorithm over text fitness function to break the encoded text. Note that you may need to run it several times to find completely accurate solution. The calculator logic is explained below the calculator.

This online calculator performs Kasiski examination of an entered text using trigrams in attempt to discover a key length