Writing secret codes and sending hidden messages

By Gyles Brandreth, Gyles Daubeney Brandreth

Subjects: Juvenile literature, Ciphers, Cryptography

Description: Explains how to use secret codes, including Morse, Caesar's, Sandwich, Rosicrucian, and others, as well as how to send hidden messages using invisible ink, how to take fingerprints, and other tricks and techniques.