A compiled list of tools and resources for cryptography, steganography, and password cracking — assembled during the 2020 NCL season with the U of A Cybercats.
Walking through the first part of the 2012 Cicada 3301 puzzle — Caesar ciphers, steganography, Mayan numerals, book ciphers, and a phone number that no longer works.
Vim and LaTeX are probably the most useful word-processing tools I've ever used — with notes on Knuth, BibTeX, regular expressions, and the grammar of Vim commands.