What is Zero Trust: model, principles and how to apply it

Zero Trust is a security model that grants no implicit trust to any user or device, inside or outside the corporate network, and verifies every single access request based on identity, context and least privilege.

What the Zero Trust model is

Traditional security was based on the perimeter: whoever was "inside" the network was considered trustworthy. With the cloud, remote work and the identities of partners, devices and agents, that perimeter no longer exists. The Zero Trust principle can be summed up in one phrase: "never trust, always verify". Every access is treated as potentially hostile and must be explicitly authenticated and authorized, regardless of where it comes from.

The key principles of Zero Trust

• Verify explicitly: authenticate and authorize every request based on identity, device, location and risk.
• Least privilege: grant only the access strictly needed, for the time strictly needed.
• Assume breach: design as if an attacker were already inside — segment, limit lateral movement, log everything.

Identity is the new perimeter

If the network is no longer the trust boundary, the boundary becomes identity. That is why IAM is the practical foundation of Zero Trust: it manages who each user is, what privileges they have and under which conditions they can access. Without governed identity, Zero Trust stays a slogan.

The role of MFA and conditional access

Explicit verification is realized through MFA and conditional access: policies evaluate the context (managed device or not, location, time, operation sensitivity) and decide whether to grant access, ask for an additional factor or deny it. It is the heart of a Zero Trust approach to access.

Least privilege in practice

Assign permissions by role and review them over time, avoid standing privileges on administrative accounts, and revoke access when a role changes. Timely provisioning and deprovisioning are an integral part of the model.

Zero Trust and compliance (NIS2, ISO 27001)

Zero Trust logic — identity verification, MFA on sensitive access, least privilege, traceability — is aligned with the requirements of NIS2 and with ISO 27001 good practices, and strengthens the data protection required by GDPR.

How to apply Zero Trust with LoginMaster

LoginMaster provides the building blocks for an identity-based Zero Trust model: strong authentication, adaptive MFA, conditional access and access governance, with the Tenant-Cloud architecture that keeps personal data on the customer's tenant. Explore our security and our Zero Trust approach, or write to us via contact us.