Rule No. 1: The Illusion of Absolute Security - No IT system can guarantee 100% protection.
Rule No. 2: The Factor of Time and Resources - Any system can be breached, it is simply a matter of the threat actor's time, budget and determination.
The Principle of Economic Resistance - True cybersecurity isn't about being invincible, it’s about raising the cost of an attack until the prize is no longer worth the effort.
Think of your computer's security like a medieval castle. You don't have just one wall; you have many layers to protect the treasure inside.
The Human Layer (You): This is the person using the device. It is the most important layer because you make the decisions.
The Perimeter Layer (The Gate): This is your router and firewall. It tries to block "bad" traffic from the internet before it reaches your house.
The Network Layer (The Hallways): This is how your devices talk to each other. Good security here prevents a virus on one computer from jumping to another.
The Endpoint Layer (Your Device): This is your actual laptop or phone. This is where tools like AppLocker and Antivirus work.
The Application Layer (The Apps): These are the programs you use, like your browser or Word.
The Data Layer (The Treasure): This is the final layer—your photos, passwords, and files.
Hackers usually take the easiest path. They don't try to break "thick walls" if they can just trick someone into opening the door.
Human Layer
Risk Level: Extreme
Common Attacks: Phishing, Social Engineering
The "Weak Spot": Being tricked into giving away a password
Best Defense: FIDO2, Multi-factor authentication (MFA), Passkeys & Training
Network Layer
Risk Level: Hight
Common Attacks: WiFi Sniffing, Lateral Movement
The "Weak Spot": No Segmentation, weak WiFi passwords, weak Firewall rules
Best Defense: Segmentation, WPA3 Encryption & Guest Networks, Honeypot, dot1x authentication
Endpoint Layer
Risk Level: Hight
Common Attacks: Malware, Ransomware
The "Weak Spot": Running unverified files or apps, unverified Chrome and Edge browser extensions
Best Defense: WhiteListing(AppLocker, GPO) & Antivirus
Application Layer
Risk Level: Hight/Medium
Common Attacks: Software Exploits
The "Weak Spot": Using old, unpatched versions of apps
Best Defense: Regular Updates(update automation)
Data Layer
Risk Level: Medium
Common Attacks: Data Theft, Encryption
The "Weak Spot": Keeping data in "plain text" (readable), no backups
Best Defense: Full Disk Encryption & Backups