Vigenère Cipher Cryptanalysis Revisited – The Undeciverable Cipher Deciphered

#cryptology, #cryptography, #cryptanalysis In this video, we discuss the Vigenère cipher and how to cryptanalyze it. The Vigenère cipher was actually invented by Bellaso. Vigenère invented the so-called Autokey cipher. Recently, we updated the Vigenère Analyzer component in CrypTool 2 to allow plaintext and ciphertext alphabets of reduced lengths. This allows to analyze original historic Vigenère-encrypted ciphertexts since often reduced alphabets were used. We discuss the theory behind the Vigenère cipher and the Autokey Cipher. Also, we show practically how to create a Vigenère Cipher in CrypTool 2 (also with reduced alphabets) and how to break these using the Vigenère Analyzer. If you are interested in learning the basics of cryptology, you should also have a look at our video series about basics of cryptology – also for beginners: https://youtu.be/jbumW7Ym03o You may download the latest version of CrypTool 2 from here: https://www.cryptool.org/en/ct2/downloads Like what I do 😄? Help fuel my crypto obsession 🎓 — buy me a coffee here☕— thx: https://buymeacoffee.com/cryptographyforeverybody