Also called an Ottendorf cypher, the book cypher is a series of numbers that are used with a known piece of text to hide a message in plain sight. This works really well if two people have the same book and the series of numbers are sent back and fourth to each other.
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There are so many great kids books that include secret codes and ciphers in their stories, and even more non-fiction books about the history of codes and ciphers, plus some awesome hands-on coding activity books. If you love secret codes and code breaking you'll love this selection of our favourite books about secret codes and ciphers.
1. Cryptography Certification by Stanford University (Coursera) Dan Boneh is a professor at Stanford University that primarily focuses upon cryptography applications to computer security. During this online class, he will teach you inner workings of cryptographic systems.