Someone knows how to find key length of vigenere ciphertext effectively? I wrote a code for coincidence method to find key length. Sometimes it works, sometimes it doesn't.
Or i fucked up while implementing it?

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    P.S. - This is not my homework
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    @darkLord oh, well then we can't help you, we do only homeworks here.
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    You need a frequency list of all letters and letter combinations in the Language. After that you need to try out which length it could be, unless the keyword has the same length like the plaintext
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