Do you want to learn how to keep your secrets, create encrypted messages and surprise classmates with knowledge in cryptography - the science of creating, using and breaking ciphers? 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 how 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 special services, because all encryption methods described in the book are still used! What if you can create your own unique encryption method?