There's no one thing a company can do to be secure. First, every company is unique; what works well for one might not work for another. Second, there's no such thing as 100% security; companies can do things to reduce and manage risk, but they can never eliminate it. Third, companies are constantly changing; just because a company is secure today doesn't mean it will be secure tomorrow.

It's also true that a company can do many things to not be secure. For example, most companies are very good at not implementing proper security. But instead of telling you the wrong ways things can be done, I'm going to focus on some general principles, which, if religiously followed, will enable most companies to attain a reasonable level of security.

Let's examine the following four core principles and see how they can be applied:

- Know thy system
- Principle of least privilege
- Defense in depth
- Prevention is ideal, but detection is a must

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