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Identity & Access

What is Zero Trust? Zero Trust Security Model Explained

Learn about the Zero Trust security model, its core principles of 'never trust, always verify,' and how to implement Zero Trust architecture.
By VigilbasePublished Updated
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Zero Trust is a security model based on the principle of 'never trust, always verify.' Unlike traditional security models that trust users and devices inside the network perimeter, Zero Trust requires strict identity verification for every person and device trying to access resources, regardless of their location. This approach is essential in today's world of remote work and cloud computing where the traditional network perimeter no longer exists.

Core Principles of Zero Trust

Zero Trust is built on several fundamental principles that guide its implementation.
1.Never trust, always verify: All access requests are fully authenticated and authorized
2.Assume breach: Design systems assuming attackers are already inside
3.Least privilege access: Users get minimum access needed for their role
4.Micro-segmentation: Divide networks into small, isolated segments
5.Continuous validation: Constantly verify user identity and device health

Zero Trust Components

Implementing Zero Trust requires several key technologies and capabilities working together.
1.Identity and Access Management (IAM)
2.Multi-Factor Authentication (MFA)
3.Zero Trust Network Access (ZTNA)
4.Secure Web Gateway (SWG)
5.Cloud Access Security Broker (CASB)
6.Endpoint Detection and Response (EDR)
7.Data Loss Prevention (DLP)

Zero Trust vs. VPN

Traditional VPNs grant broad network access once connected, trusting users implicitly. Zero Trust replaces this with granular, application-specific access that continuously validates user identity and device posture. This reduces the attack surface and limits the damage if credentials are compromised.

Key Takeaways

✓Zero Trust eliminates implicit trust in any user or device
✓Essential for securing remote work and cloud environments
✓Requires identity-centric security approach
✓Significantly reduces attack surface compared to VPNs

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Frequently Asked Questions

Is Zero Trust the same as ZTNA?

ZTNA (Zero Trust Network Access) is one component of a Zero Trust architecture. While Zero Trust is the overall security philosophy, ZTNA specifically refers to the technology that provides secure, identity-based access to applications without traditional VPN.Zero Trust network access explainedSASE architecture explained

How long does Zero Trust implementation take?

There is no universal timeline. First inventory the applications, identities, devices and access paths in scope, then identify legacy dependencies and policy owners. Pilot a limited set of users and applications, verify intended access and rollback, and expand in phases. Set milestones around those acceptance checks; ongoing policy and access review continues after the initial rollout.Internal access and Zero TrustDiscuss your scope with Vigilbase

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