References
These sources can help you further your understanding of cryptography and
the exercises presented here:
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Wikipedia!
Wikipedia has many useful articles on cryptography, including:
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CrypToolOnline
This website can be used to try classical ciphers and classical cryptanalysis techniques.
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dcode.fr
This website is similar to CrypTool Online, with various tools for cipher application and analysis.
Other Resources
Download the split_into_groups.py
Python tool to help you with the Vigenere Cipher.