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Zero Trust Security Implementation Guide
Security

Zero Trust Security Implementation Guide

Heshan Sathyanga
Heshan Sathyanga
Technical Lead
December 12, 2025 12 min read

Zero Trust: Never Trust, Always Verify

Zero Trust is a security model that requires strict identity verification for every person and device trying to access resources on a private network, regardless of whether they are sitting within or outside of the network perimeter.

Core Principles

  1. Verify Explicitly: Authenticate and authorize based on all available data points (identity, location, device health).
  2. Use Least Privilege Access: Limit user access with Just-In-Time and Just-Enough-Access (JIT/JEA).
  3. Assume Breach: Minimize blast radius and segment access. verify end-to-end encryption.

Implementing Zero Trust

1. Identity & Access Management (IAM)

Move beyond simple passwords. Implement MFA (Multi-Factor Authentication) and SSO everywhere.

2. Network Segmentation

Don't have a flat network. Use VLANs and micro-segmentation to ensure that if one server is compromised, the attacker can't move laterally.

3. Continuous Monitoring

Real-time analytics is key. Use SIEM tools to detect anomalies in user behavior.

Conclusion

Perimeter-based security is dead. Zero Trust is the only way to secure modern, distributed workforces.


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