Codes and ciphers; secret writing through the ages.

Title Codes and ciphers; secret writing through the ages.
Names Laffin, John.
Book Number BR000039
Title Status Blank
Medium B
Annotation The subject of cryptography is introduced through brief accounts of its use in historical incidents. The author discusses the basic principles of ciphering and deciphering, types of codes, and methods of transmitting messages. For grades 6-9.
LC Subject Grades 6-9 & Young Adult -
The Arts & Architecture -
The Sciences -
Short Book -
Language English
Publication Info <none>
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