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<http://worldcat.org/entity/work/id/2975689> <http://schema.org/description> "Discusses and provides practice in making and breaking codes and ciphers, as well as in building simple coding devices to transmit secret messages. Information on breaking and building codes as well as historical background on ciphers are included in this easy-to-understand text. An introduction to both making and breaking codes and how to transmit secret messages." .