Looking for fun?
Want to mystify everybody you know?
Do you need to send really private messages?
Here's just the book for you. Easy-to-Follow, step-by-step explanations of how secret codes can be made. You can practice both encoding and decoding. You'll even learn to work out a code of your own that will fool many a code expert!
You'll have fun learning about position codes, code wheels, secret languages, reverse codes- and many more. Best of all, there are two entire chapters on secret writing and invisible inks.
Se go to it...but make sure no one's looking over your shoulder!
Codes & Secret writing (authorized abridgment) by Herbert S. Zim