Links for additional content Learn more about crypto, starting at the beginning: https://cryptopals.com/sets/1 https://www.crypto101.io/ Crypton is an educational library to learn and practice Offensive and Defensive Cryptography in python. Learn more about protocols/etc. more advanced than above. Obscurity in addition to strong security. SSL/TLS1.3 Miscellaneous X.509(PKI) Style Guide Two Factor U2F token backups/duplication using U2F Zero