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Zero Trust Architecture
Continuously evaluates access without trusting network location alone
Why learn Zero Trust Architecture?
It applies identity, device, resource, and context controls to each request
The problem it solves
It removes implicit trust created by being inside a perimeter
Where it came from
Zero Trust Architecture is a security concept that continuously evaluates access without trusting network location alone. Its guarantees and tradeoffs depend on the concrete implementation and operating context.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Define Zero Trust Architecture and distinguish it from a neighboring concept.
- Choose a realistic task where Zero Trust Architecture is appropriate.
- Identify a failure mode caused by misusing Zero Trust Architecture.
- Interpret a small design or result involving Zero Trust Architecture.
- Explain one tradeoff or limitation of Zero Trust Architecture.
Documentation and sources
- OWASP Developer Guide: Security Principles (devguide.owasp.org)
Connect the ideas
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Real World Example
Continuous Verification for Distributed Logistics
Global logistics firms managing distributed warehouse IoT sensors and remote administrative portals.
The business problem
Traditional perimeter-based security relies on network location, allowing lateral movement once an attacker gains internal network access.
How this topic solves it
Zero Trust Architecture implements Complete Mediation, ensuring every access request is evaluated for authorization regardless of the subject's network origin.
- Define granular identity-based access policies for every service and user.
- Implement a policy enforcement point that intercepts all traffic to verify credentials and context.
- Enforce Complete Mediation by validating authorization rights upon every individual request.
- Apply Least Privilege to ensure subjects only access the specific resources required for their current task.
Illustrates how every request is mediated by a central policy engine.
Interception layer
Authorization logic
Target application or data
- User/Device → Access Request → Policy Enforcement Point
- Policy Enforcement Point → Verify Authorization → Policy Decision Engine
- Policy Decision Engine → Grant/Deny → Policy Enforcement Point
- Policy Enforcement Point → Forward Traffic → Resource
Expected business outcome
Reduced risk of lateral movement and unauthorized access, as network location is no longer a proxy for trust.
Limitations and checks
Increased latency due to constant policy evaluation; check this by monitoring request processing times against defined service level objectives.