The Vigenère cipher is a method of encrypting alphabetic text by using a series of different Caesar ciphers based on the letters of a keyword. It is a simple form of polyalphabetic substitution.
In the Vigenère cipher each letter of a message is shifted along some number of places with different shift values. To encrypt, a table of alphabets can be used, termed a tabula recta, Vigenère square, or Vigenère table. It consists of the alphabet written out 26 times in different rows, each version of the alphabet is shifted cyclically to the left compared to the previous alphabet. At different points in the encryption process, the cipher uses a different alphabet from one of the rows. The alphabet used at each point depends on a repeating keyword.
\ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z \---------------------------------------------------- A| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z B| B C D E F G H I J K L M N O P Q R S T U V W X Y Z A C| C D E F G H I J K L M N O P Q R S T U V W X Y Z A B D| D E F G H I J K L M N O P Q R S T U V W X Y Z A B C E| E F G H I J K L M N O P Q R S T U V W...
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium
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