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Layered security refers to security systems that use multiple components to protect operations on multiple levels, or layers. This term can also be related to the term defense in depth, which is based on a slightly different idea where multiple strategies and resources are used to slow, block, delay or hinder a threat until it can be completely neutralized.
Layered security may also be known as layered defense.
The central idea behind layered security or defense is that in order to protect systems from a broad range of attacks, using multiple strategies will be more effective. Layered security can involve security protocols at the system or network levels, at the application level, or at the transmission level, where security experts may focus on data in use over data at rest.
Layered security efforts attempt to address problems with different kinds of hacking or phishing, denial of service attacks and other cyberattacks, as well as worms, viruses, malware and other kinds of more passive or indirect system invasions.
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