Chapter 3: Physical Security Flashcards
What is CPTED
(Crime prevention through environmental design)
- Design the environment to avoid crime (Eg less secluded areas, clear visibility, benches to sit etc)
- Different from target hardening which is putting locks, alarms, motion detectors etc
- First CPTED and then target hardening on top of it
What are the three strategies of CPTED
- Natural access control
- Natural surveillance
- Natural territorial reinforcement
What is natural access control in CPTED
guiding and protectecing through bollards, fences, walkways etc
What is natural survelliance in CPTED
Open areas, CCTV camera, seating space for general public so that they inadvertently become watchers and deter criminal activity
Goal is to make criminals feel uncomfortable by providing many ways that observers can see them
What is Natural territorial reinforcement in CPTED
create physical designs that emphasize or extend the companys physical sphere of influence. Implemented through walls, fences, light fixtures, landscaping, flags, addresses, sidewalks etc.
Goal is to create a sense off dedicated community in which legitimate users feel safe and belongingness while intruders feel out of place
Fail-safe vs Fail-secure
Fail-safe - doors are default opened on power disruption (note keyword safe as in it relates to personnel safety)
Fail-secure - doors are default closed or secured on power outage
What are the threats addressed by physical security
- Theft
- Interruptions to service
- Physical damage
- Compromised system and environment integrity
- Unauthroised access
What are the different types of fire detectors
Smoke activated (Photoelectric)
Heat activated (preset temperature or rate of rise of temperature)
Where should fire detectors be placed
In ducts
Over false ceilings
Under raised flooring
use of CO2 for fire extinguishing
CO2 is good for putting out fires but bad for life forms – it sucks out the oxygen. It should be used carefully in unattended facilities and areas
