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IPSec: The New Security Standard for the Internet, Intranets, and Virtual Private Networks, Second Edition by Dan Harkins, Naganand Doraswamy

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Chapter 1. Cryptographic History and Techniques

Since the beginning of time people have kept secrets. Probably from the beginning of your memory you have done the same. It's a natural human desire. People have always had, and always will have, some secrets that they either want to keep to themselves or share with only a privileged few. The easiest secret to keep is one that you will tell to no one. The more people you wish to share a secret with, and the more public the forum in which you will communicate your secret, the harder it is to keep your secret a secret.

Secrets in History

In antiquity it was easier to keep a secret because the ability to read was a privilege known to a select few. The number of people who could read a written secret was ...

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