To protect against attack we often refer to security as being multi-layered. Each layer reinforces the layer before and after it. The system may have vulnerable components. In fact, often security systems have point failures designed into them. But they are virtually invulnerable as a system.

An unlocked office is an example of a security system with vulnerability built into it. The door is the first layer of physical security, and it is easily bypassed during the day. It's also easily bypassed at night, when cleaners leave the door open while they are working.

By Rob Enderle at Security Pipeline.

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