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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Creators
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Publisher
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Release date
June 28, 2013 -
Formats
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OverDrive Read
- ISBN: 9781464504099
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EPUB ebook
- ISBN: 9781464504099
- File size: 3754 KB
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Languages
- English
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Levels
- Lexile® Measure: 820
- Text Difficulty: 3-4
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Reviews
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