Zero Trust and Traditional (Non–Zero Trust) security models.
🔒 Zero Trust vs. Traditional Security Model
| Category | Zero Trust Security | Traditional Security (Not Zero Trust) |
|---|---|---|
| Core Philosophy | “Never trust, always verify.” Every user, device, and connection must be authenticated and authorized. | “Trust but verify.” Anything inside the network is automatically trusted once verified at the perimeter. |
| Perimeter Concept | No fixed perimeter — security is identity- and context-based. | Network perimeter (firewall/VPN) is the main line of defense. |
| Access Control | Continuous and adaptive verification based on identity, device health, and behavior. | One-time authentication at login; session remains trusted. |
| Trust Model | Zero implicit trust — all requests evaluated dynamically. | Implicit trust for anything inside the corporate network. |
| User Authentication | MFA, device posture, and risk-based re-verification for every access. | Basic username/password once per session. |
| Device Security | Every device must be registered, compliant, and continuously monitored (via MDM/EDR). | Devices inside the network are assumed safe. |
| Network Segmentation | Micro-segmentation and least privilege access limit lateral movement. | Flat or broad network zones allow internal spread if breached. |
| Data Protection | Data access governed by sensitivity, identity, and context (via DLP/CASB). | Limited visibility and control once inside network boundaries. |
| Visibility & Monitoring | Continuous monitoring and analytics (via SIEM, UEBA). | Focus on perimeter logs and alerts; limited internal insight. |
| Response to Threats | Automated detection, isolation, and real-time response. | Reactive response after perimeter defenses fail. |
| Cloud & Remote Access | Designed for hybrid and remote work — integrates with cloud-native tools (SASE, CASB). | Perimeter VPN access extended from on-prem; not cloud-optimized. |
| Implementation Style | Continuous, identity-centric, adaptive security. | Static, location-centric, perimeter-based security. |
| Goal | Reduce attack surface and limit breach impact by verifying every action. | Keep attackers out of the network — assumes inside = safe. |
🧠 Summary
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Zero Trust: dynamic, identity-based, and continuous.
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Not Zero Trust: static, perimeter-based, and assumption-driven.
1. EDR (Endpoint Detection and Response)
Detects and responds to endpoint threats like malware, ransomware, and insider attacks.
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2. IDaaS (Identity as a Service)
Manages user authentication, SSO, and access policies across systems.
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3. MDM (Mobile Device Management)
Remotely manages and secures mobile devices and endpoints.
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4. SWG (Secure Web Gateway)
Protects users from web threats by filtering, inspecting, and controlling internet traffic.
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5. CASB (Cloud Access Security Broker)
Secures cloud usage by monitoring activity, enforcing policies, and detecting risks.
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6. SASE (Secure Access Service Edge)
Integrates network and security functions (SD-WAN, SWG, CASB, ZTNA) into a cloud model.
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7. SIEM (Security Information and Event Management)
Collects and analyzes security logs for detection and compliance.
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8. DLP (Data Loss Prevention)
Prevents sensitive data from leaking externally via endpoints, cloud, or email.
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