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🧩 Zero Trust Architecture

✅ Overview​

Security architecture that assumes "Trust No One" and continuously verifies all communications. A modern model to overcome the limitations of perimeter defense.

✅ Problems Addressed​

  • Limitations of security based on perimeter defense (Firewall).
  • "Disappearance of perimeter" due to Cloud / SaaS / Remote Work.
  • Increase in internal breaches (Insider threats / Credential leaks).
  • Unlimited access once inside the network.

✅ Basic Philosophy & Rules​

  • "Never trust, always verify"
  • ID-based access control (Strict authentication/authorization by IAM).
  • Micro-segmentation (Fine-grained boundaries).
  • Device verification / Context authentication.
  • Communication encryption (mTLS).
  • Continuous application and audit of policies.

✅ Suitable Applications​

  • Cloud / Multi-cloud environments.
  • Organizations assuming remote work.
  • Areas with strict security requirements (Finance / Government).
  • Microservices utilizing Service Mesh + mTLS.

❌ Unsuitable Cases​

  • Simple on-premise only networks.
  • Organizations where IAM is undeveloped and cannot afford to build authentication infrastructure.

✅ History​

  • Modeled by Google BeyondCorp.
  • Concept of Zero Trust standardized as framework (NIST etc.).

✅ Related Styles​

  • Service Mesh: Good compatibility with mTLS / Policy management.
  • DevOps / SRE: Aspect of security automation.
  • Identity & Access Management: Central infrastructure.

✅ Summary​

Zero Trust is the standard form of modern security standing on the premise of 'Do not trust the network',
and is built across all layers of App, Network, and Device.