From the Author
Welcome to the YOUNG READER'S edition of The Code Book. I edited and re-wrote large chunks of the original book to make it suitable for young teenagers, and I hope that you will find it an interesting and exciting introduction to cryptography.
There are very few science books for younger people, so I was keen to rework The Code Book for this readership. Cryptography is a subject that has a great appeal for students interested in science, history, technology and the Informaion Age. I hope that I have created a more digestible version of The Code Book, without sacrificing any of the meaty ideas and scientific concepts that were in the original book.