Secret messages
Subtitle: concealment, codes, and other types of ingenious communication
By: William S. Butler and L. Douglas Keeney.
Contributors: Keeney, L. Douglas.
Publisher: Simon & Schuster
Published: 2001
Place of publication: New York
Language: eng
Number of pages: 192
Subjects: Cryptography.; Ciphers.
Notes: Includes bibliographical references (p. 179-181) and index.