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

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ปกของ 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.

€35.95

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ภาษา อังกฤษ ● รูป PDF ● หน้า 48 ● ISBN 9780766046986 ● สำนักพิมพ์ Enslow Publishing, LLC ● การตีพิมพ์ 2012 ● ที่สามารถดาวน์โหลดได้ 3 ครั้ง ● เงินตรา EUR ● ID 8663255 ● ป้องกันการคัดลอก Adobe DRM

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Susan K. Mitchell

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