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

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perlindungan daripada 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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Bahasa Inggeris ● Format PDF ● Halaman-halaman 48 ● ISBN 9780766046986 ● Penerbit Enslow Publishing, LLC ● Diterbitkan 2012 ● Muat turun 3 kali ● Mata wang EUR ● ID 8663255 ● Salin perlindungan Adobe DRM

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Susan K. Mitchell

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