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

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Copertina di 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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Lingua Inglese ● Formato PDF ● Pagine 48 ● ISBN 9780766046986 ● Casa editrice Enslow Publishing, LLC ● Pubblicato 2012 ● Scaricabile 3 volte ● Moneta EUR ● ID 8663255 ● Protezione dalla copia Adobe DRM

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