Cover of Spy codes and ciphers

Spy codes and ciphers

by Susan K. Mitchell

2011 eng

Spies, juvenile literature Ciphers Cryptography Espionage Spies Juvenile literature

"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.

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