Loads of codes and secret ciphers
By: Paul B. Janeczko.
Publisher: Macmillan; Collier Macmillan
Published: 1984
Place of publication: New York; London
Language: eng
Number of pages: 108
Subjects: Cryptography -- Juvenile literature.; Ciphers -- Juvenile literature.; Cryptography.; Ciphers.
Description: Discusses and provides practice in making and breaking codes and ciphers, as well as in building simple coding devices to transmit secret messages.
Notes: Includes index.