Spy Technology

Spy Technology

4.11 - 1251 ratings - Source

Learn about new tools for spies.By the beginning of the twentieth century, spies had turned from ciphers to codes. In a code, words are ... Without the secret codebook, you must use mathematical formulas to crack the code and figure out what it means. When a Britishanbsp;...

Title:Spy Technology
Author: Ron Fridell
Publisher:Lerner Publications - 2007

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