Zero Trust can sound like an enterprise security programme that requires a complete redesign. In practice, its core principles can also guide smaller organisations towards better identity, device and access decisions.
Zero Trust is not a product
Microsoft describes Zero Trust around three principles: verify explicitly, use least-privilege access and assume breach. That means access should be evaluated using relevant signals, users should receive only the access they need, and security design should anticipate that an account or device could eventually be compromised.
Verify identity and context
Multi-Factor Authentication and Microsoft Entra Conditional Access are practical examples of stronger verification. Depending on the organisation, access decisions can consider identity, device state and other relevant signals rather than relying only on a password or network location.
Bring devices into the access decision
Microsoft Intune can establish device compliance requirements, while Entra Conditional Access can use compliance information when deciding whether access should be granted. This helps move security away from the assumption that every device presenting valid credentials should be trusted equally.
Apply the principles progressively
- Strengthen authentication and protect privileged accounts.
- Review who has access to important systems and reduce unnecessary privilege.
- Manage devices and define appropriate compliance expectations.
- Use Conditional Access carefully to enforce access requirements.
- Improve monitoring and be prepared to respond when suspicious activity occurs.
For many organisations, Zero Trust is best approached as a direction of travel rather than a one-day transformation. Start with the highest-value identity and device controls, test changes carefully and improve the environment in manageable stages.