This book is highly recommended if you want to know more about encryption, but are afraid of the mathemathical concepts. It starts of super easy with a simple caesar shift (the kind of secret code children use) and builds from there. I'm a total math noob but thanks to this book I wrote a simple public-key encryption service. The book contains tons of examples and even challenges, if you're up to it.

If you haven't read this book, go on and do so!