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

Видео Vigenère Cipher Cryptanalysis Revisited – The Undeciverable Cipher Deciphered канала Cryptography for Everybody