Spy codes and ciphers

By Susan K. Mitchell

Subjects: Juvenile literature, Spies, juvenile literature, Spies, Espionage, juvenile literature, Ciphers, Espionage, Cryptography

Description: "Discusses different methods of secret communications used by spies, such as Morse code, the Enigma machine, the Najavo language, and digital steganography, and includes career information"--Provided by publisher.