Loads of codes and secret ciphers /

Discusses and provides practice in making and breaking codes and ciphers, as well as in building simple coding devices to transmit secret messages.

Bibliographic Details

Main Author:	Janeczko, Paul B.
Format:	Book
Language:	English
Published:	New York : London : Macmillan ; Collier Macmillan, [1984]
Subjects:	Cryptography > Juvenile literature. Ciphers > Juvenile literature. Cryptography. Ciphers.