Secret writing
Subtitle: the craft of the cryptographer.
Publisher: McGraw-Hill
Published: 1970
Place of publication: New York
Language: eng
Number of pages: 192
Subjects: Cryptography -- Juvenile literature; Ciphers; Cryptography
Description: Explains the distinction between ciphers and codes and describes their past and present use in secret communications.
Notes: Bibliography: p. [185]-188.