Because knowledge can also lead to the dark side...
Project Vectivus is a public resource for analyzing and solving CTFs, cryptographic puzzles, and other logic challenges.
A visual reference to many substitution ciphers.
Ciphers which do not involve simple substitution approaches.
Software and scripts that can help to automatically solve certain challenge types.
Quick help with regular expression logic and coding.
Challenges archived from around the Internet and various contests/competitions for you to try your own hand at. Solutions may or may not be available.
Solutions formally captured/explained for various challenges and CTFs, including from public archives as well as ones created by Hermit.
Tools and Links