Mysterious messages
Subtitle: a history of codes and ciphers
By: Gary Blackwood.
Edition: 1st ed.
Publisher: Dutton Children's Books
Published: 2009
Place of publication: New York
Language: eng
ISBN-13: 9780525479604
Subjects: Cryptography -- History -- Juvenile literature; Ciphers -- History -- Juvenile literature
Genres: Juvenile literature.