Do you want to learn how to keep your secrets, create encrypted messages and surprise your classmates with your knowledge of cryptography - the science of creating, using and breaking codes? In this book you will get acquainted with secret knowledge and skills that are available only to a select few - spies, secret agents, scientists. Together we will learn to encode messages using different encryption methods, solve existing secret messages, make encryption machines, and even create our own original ciphers and riddles! You have a unique opportunity to get acquainted with the real world of secret agents and intelligence services, because all the encryption methods described in book, are still used today! What if you can create your own unique encryption method?