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Home Encryption

Encryption is a safe harbor. It is one of those things that you use sparingly. The Electronic Frontier Foundation (www.eff.org) lists using encryption as one of the steps to protecting your online privacy. It is the innermost layer of protection in your strategy of Defense in Depth. Defense in Depth is the concept of providing multiple layers of protection. In the Middle Ages when a threat to your personal security was an advancing army, your outer castle walls were intended to be your first lines of defense, and armed watch guards protecting your inner treasure were your last lines of defense. These days, the more realistic threats are teenage hackers with Internet connections. For personal data, your last line of defense is encryption.

Figure 12.15 illustrates the concept of Defense in Depth, an idea that is reiterated throughout this book. When you apply security at different layers, you are building a Defense in Depth. The concept can be illustrated with concentric circles, each representing a different layer of defense. Notice the hacker outside of the area of defense. The hacker must contend with three layers before getting to the confidential files:


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