The Onion Approach
Security is a relative term, because even the most secure infrastructures are subject to vulnerabilities, and an environment is only as secure as its weakest link. One of the best defenses, however, is deploying multiple layers of security on critical network data. Using multiple layers of security is often referred to as the onion approach, where different stages or layers of security are used to protect the information. Generally speaking, as the information becomes more sensitive or confidential, the number of onion layers increases to thwart unauthorized access.
The premise behind the onion approach is that if a single layer of security is compromised, the intruder will have to bypass the second, third, fourth, and so on ...
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