Secret Code Book
Congratulations on reading this book! Be sure to go back to the introduction and complete the bonus mission. I hope you have learned something new and now have a better understanding of cryptography.
Remember, this is a rich subject and we have only touched the surface. You are encouraged to experiment, do more research and share your new knowledge. As with any new skill, your ability to persist comes with patience, time and practice.
Also, be sure to add as much math, computer science and statistics to your educational goals. We live in exciting times where information is readily available for you to explore — take advantage of this and my recommendations that follow:
Top Secret: A Handbook of Codes, Ciphers, and Secret Writing by Paul Janeczko
The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography by Simon Singh
Search Terms: Cryptography, rot-n, Caesar Cipher, rot13, frequency analysis, enigma machine, bombe, ASCII, binary, geometric ciphers, Morse Code, monoalphabetic ciphers, polyalphabetic ciphers