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In The Code Book, By Simon Singh

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In the Code Book, by Simon Singh he talks about how the exchange of digital information over the internet has become the most used way to send messages and mail. The use of cryptography is being used to encrypt emails or important messages. Paper mail has slowly decreased because of everyone using the internet to do everything and making it easier for someone to intercept an important message . However, when sending the information or message thru paper mail it is more difficult for someone to intercept the message, but if using the internet if you don't send it encrypted it can be easy for the message to be read by someone else.

In The Dark Game by Paul Janeczko he talks about how spies would send messages about their enemies. They would

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