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A security model that assumes breach and continuously verifies users, devices, and requests before granting minimal access.
DESCRIPTION
Zero Trust shifts defense from network perimeters to continuous verification of identities, devices, and context. Access is granted just-in-time and just-enough, based on dynamic policy, telemetry, and risk. The model emphasizes strong authentication, microsegmentation, and continuous monitoring to limit lateral movement. It aligns security controls around data, assets, applications, and services. Adopting Zero Trust is a journey requiring architecture changes, governance, and culture shifts.
ALTERNATIVE DEFINITIONS
NIST SP 800-207
Zero trust (ZT) is the term for an evolving set of cybersecurity paradigms that move defenses from static, network-based perimeters to focus on users, assets, and resources.
Defines ZT as paradigms shifting focus from perimeters to entities and resources.
NSA Cybersecurity Information
Zero Trust is a security model, a set of system design principles, and a coordinated cybersecurity and system management strategy.
Stresses Zero Trust as design principles and coordinated strategy.
RELATED TERMS
Least Privilege Microsegmentation Identity Management Continuous Authentication Device Posture Policy Engine Software-Defined Perimeter Strong Authentication Conditional Access Network Segmentation
COMPETING TERMS
Perimeter-Based Security Implicit Trust
KNOWLEDGE AREAS
Data Security AI Governance Data Governance Cloud Infrastructure
TARGET AUDIENCE
Chief Information Security Officer Security Architect Cybersecurity Engineer Cloud Architect IT Manager Chief Information Officer Chief Technology Officer
EXTERNAL SOURCES
- Wikipedia - Zero trust security model
- NIST - Foundational Zero Trust guidance.
- CISA - Zero Trust maturity model.
- Microsoft - Vendor-aligned Zero Trust overview.
TOP QUESTIONS
Why is Zero Trust still relevant?
Traditional perimeters are insufficient for cloud, remote work, and SaaS. Zero Trust reduces lateral movement and assumes breach, improving resilience to modern threats.
Category: Relevancy
What are the core tenets of Zero Trust?
Verify explicitly, use least privilege access, and assume breach. Telemetry and policy drive continuous evaluation of identities, devices, applications, and data.
Category: Concept
How do organizations start adopting Zero Trust?
Inventory assets and identities, define protect surfaces, implement strong authentication, and segment access. Iterate with a roadmap aligned to a maturity model.
Category: Getting started
What is the biggest misunderstanding about Zero Trust?
That it’s a product. Zero Trust is a strategy and architecture requiring integrated controls, governance, and culture changes across the enterprise.
Category: Misunderstanding
How does Zero Trust interact with legacy networks?
It overlays identity-centric controls and segmentation. Gateways, proxies, and enforcement points bring legacy systems under Zero Trust policies.
Category: Integration
What are common pitfalls in Zero Trust implementations?
Treating it as a single-tool deployment, skipping policy design, and ignoring telemetry. Governance and change management are critical.
Category: Mistakes
What risks does Zero Trust mitigate most effectively?
It reduces lateral movement, credential replay, and implicit trust abuse by enforcing continuous verification and least privilege.
Category: Risk
How is Zero Trust measured?
Use maturity models, control coverage, reduction in attack paths, and incident response metrics. CISA’s model offers staged benchmarks.
Category: Measurement
Does Zero Trust increase user friction?
With good design, modern authentication and device signals minimize friction while increasing security. Adaptive policies tailor prompts to risk.
Category: Opinion