Monday, October 16, 2006

D4-Deny

by Robert Gruber, PSPMaster Halco Security Solutions Group


There is no such thing as true denial of "entry."

No matter what type of fence or boundary exists, there will always be a determined group or individual who finds a method of breaching it . The term "deny" is used to describe the success of the active perimeter security plan to disable an intruder’s ability to compromise assets. This is where it is vitally important that the three previous steps we’ve discussed--deter, detect, and delay--have been implemented properly.

Many texts use the terms; deter, detect, delay and "respond." We've enhanced the response activity to include both response and remedy – the overall result being denial.

“Delay” is an especially strong teammate of denial. If we can cause a long enough delay at the boundary, building in a response time that allows us to intercept the intruder and stop him before he reaches his target – our asset(s), then “deny” can be labeled a success.

A boundary marker, such as a fence, is designed to deter, detect, and delay entry at every point except the gate, where other types of access control measures are facilitated. Many times the boundary is enhanced through CPTED, crime prevention through environmental design, to lead an individual to the entry or gate area. There may be a ditch, a berm, or a landscaping design that will enhance the security aspect of the fence at all points except the access area. If someone overcomes all of this security and breaches the boundary, then the "deny" factor kicks in.

If things go right, an intrusion detection system will alert security personnel who will initiate a proper response. Perhaps personnel will travel to the breach point and stop the intruder before he reaches his target. Or the response may only be initiating lighting, allowing the intruder to become an easy target. Another type of response might be a siren sounding loudly to cause personnel at the asset area to spread outwards toward the boundary to cut off the intruder.

Regardless of the response and remedy tactics, the "deny" factor is a result of all the other perimeter security initiatives: making sure that deter, detect, and delay work efficiently together to prohibit access to your facility’s vital assets.

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