What is physical security
Physical Security
Physical security is the protection of people, buildings, equipment, and other physical assets from unauthorized access, theft, damage, or harm.
In cybersecurity, physical security is important because even the best computer security can be defeated if someone can physically access a device or facility.
Examples of Physical Security Controls
Preventive Controls
These stop incidents from occurring:
Locks and keys
Security guards
Fences and gates
ID badges
Biometric scanners (fingerprint, facial recognition)
Mantraps (two-door access systems)
Detective Controls
These identify when something happens:
Security cameras (CCTV)
Motion detectors
Intrusion alarms
Security patrols
Corrective Controls
These help recover after an incident:
Backup power generators
Fire suppression systems
Disaster recovery sites
Equipment replacement plans
Real-World Example
Imagine a company's data center:
Employees must swipe a badge to enter.
Cameras monitor all entrances.
Visitors sign in and are escorted.
The server room remains locked.
Fire suppression systems protect equipment.
These measures are all forms of physical security.
Common Physical Threats
Theft of laptops or servers
Unauthorized entry
Vandalism
Fire
Floods
Power outages
Natural disasters
Tailgating (following an authorized person through a secured door)
Physical Security and Cybersecurity
Physical security supports cybersecurity because attackers may try to:
Steal a laptop containing sensitive data
Plug a malicious device into a network port
Access a server room
Install hardware keyloggers
For example, if a hacker steals an unencrypted laptop, they may gain access to company data even without hacking the network.
CISSP Exam Tip
Physical security is often explained using layered defense (Defense in Depth):
Plain Text
Perimeter Fence
↓
Building Entrance
↓
Security Desk
↓
Access Badge
↓
Locked Server Room
↓
Locked Server Rack
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Each layer makes it harder for an attacker to reach critical assets.
Key Definition
Physical security is the protection of people, facilities, equipment, and information through physical barriers, monitoring, access controls, and environmental safeguards.
For CISSP and Security+ studies, remember: Cybersecurity protects digital assets, while physical security protects the physical assets that support them.
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