Susan K. Mitchell
Spy Codes and Ciphers [PDF ebook]

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Portada de Susan K. Mitchell: Spy Codes and Ciphers (PDF)

Can flashing lights send out a secret message? Did a famous spy use sketches of butterflies to hide messages? Can a digital photo hide a secret code? For centuries, spies have used many different ways to pass secret information. Codes and ciphers keep information safe from the enemy. Author Susan K. Mitchell uncovers the secrets to the amazing world of spy codes and ciphers.

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Idioma Inglés ● Formato PDF ● Páginas 48 ● ISBN 9780766046986 ● Editorial Enslow Publishing, LLC ● Publicado 2012 ● Descargable 3 veces ● Divisa EUR ● ID 8663255 ● Protección de copia Adobe DRM

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