Codes and Ciphers (Spy Files) - Tapa blanda

Críticas

An excellent overview... Short paragraphs and great photographs...draw readers quickly through the information. Useful for reports and browsing.--Cynde Suite, Bartow Library System, Adairsville, GA"School Library Journal" (04/01/2010)

This book gives an excellent overview of the historical and practical use of codes and ciphers in spy work. Coverage includes the Caesar cipher and Morse code, the use of Navaho code talkers during World War II, secret writing, the use of microdots, and cipher machines such as Enigma and the Japanese Purple.... The text's short paragraphs and great pictures are combined in a collage style that will draw readers quickly through the information. Useful for reports and browsing.--Cynde Suite, Bartow Library System, Adairsville, G"School Library Journal" (04/01/2010)

Reseña del editor

The enduring appeal of spies and their technology, codes and mysterious ways are explored in this engaging series of four colorful books. Each explores a different aspect of the spy trade, interspersing historical tidbits with tales of spies from popular culture and contemporary movies. Other titles in this series include: Secret Agents, Spy School, and Top Technology.

Codes and Ciphers covers everything from Caesar's alphabetic substitution system and Morse code to the Enigma machines and microdots of World War II. Sidebars explain how to create a cipher, how to craft invisible ink messages using wax and crayons and how to make a one-time pad.