Codes, ciphers, and secret writing.
Publisher: Simon and Schuster
Published: 1972
Place of publication: New York
Language: eng
Number of pages: 96
Subjects: Ciphers -- Juvenile literature; Ciphers
Description: Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.
Notes: Bibliography: p. 94-96.