Examples
Many installations, serving many different purposes, have physical obstacles in place to deter intrusion. This can be high walls, barbed wire, glass mounted on top of walls, etc.
The presence of PIR-based motion detectors are common in many places, as a means of noting intrusion into a physical installation. Moreover, VSS/CCTV cameras are becoming increasingly common, as a means of identifying persons who intrude into physical locations.
Businesses use a variety of options for physical security, including security guards, electric security fencing, cameras, motion detectors, and light beams.
ATMs (cash dispensers) are protected, not by making them invulnerable, but by spoiling the money inside when they are attacked. Money tainted with a dye could act as a flag to the money's unlawful acquisition.
Safes are rated in terms of the time in minutes which a skilled, well equipped safe-breaker is expected to require to open the safe. These ratings are developed by highly skilled safe breakers employed by insurance agencies, such as Underwriters Laboratories. In a properly designed system, either the time between inspections by a patrolling guard should be less than that time, or an alarm response force should be able to reach it in less than that time.
Hiding the resources, or hiding the fact that resources are valuable, is also often a good idea as it will reduce the exposure to opponents and will cause further delays during an attack, but should not be relied upon as a principal means of ensuring security. (See security through obscurity.)
Not all aspects of Physical Security need be high tech. Even something as simple as a thick or thorny bush can add a layer of physical security to some premises, especially in a residential setting.
Read more about this topic: Physical Security
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