Top Secret pdf epub mobi txt 电子书 下载 2024


Top Secret

简体网页||繁体网页
Janeczko, Paul B. 编
CANDLEWICK BOOKS
2006-4
144
$ 9.03
平装
9780763629724

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发表于2024-11-13

Top Secret epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024

Top Secret epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024

Top Secret pdf epub mobi txt 电子书 下载 2024



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"The author's upbeat, positive tone is refreshing and his enthusiasm about his topic is contagious." -- SCHOOL LIBRARY JOURNAL (starred review) Pssst Do you know the difference between a code and a cipher? Can you tell a St. Cyr slide from a Cardano grille? Did you know that the discovery of a substitution cipher caused Mary Queen of Scots to lose her head? Don't look now, but packed into this practical field guide is everything a young person needs to know about the art of concealment - making and breaking codes, mastering cipher systems, and experimenting with secret writing. Offering plenty of hands-on practice sessions, tips for creating a code-making kit, sidebars on secret codes in history, and an amusing pair of spies to illustrate techniques, Paul B. Janeczko's tantalizing TOP SECRET won't stay a secret for long.

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