content: The book thing is just wrong. If you use that method I guarantee anyone who really wants to will break your "encryption". A good one time pad is uncrackable. But how would you generate it? The really hard parts of encryption is (a) generating one time pads, and (b) sharing them. To the point that it's almost impossible even for advanced countries to generate enough one time pads for their own use.  These are the secrets of cryptography, and the only ones you need to know.  You don't know anything about cryptology. Anyone listening to you will be less secure than if they knew nothing.