Spy codes and ciphers

Spy codes and ciphers
About this book
"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.
Details
- OL Work ID
- OL15071063W
Subjects
CryptographyCiphersSpiesJuvenile literatureEspionageSpies, juvenile literatureEspionage, juvenile literature