Zero Trust
A security model that requires every user, device, and connection to be continuously verified, regardless of whether they are inside or outside the corporate network.
Also known as: zero-trust architecture, ZTA, never trust always verify
Last reviewed: 1 June 2026
Zero trust is a cybersecurity framework built on the principle of 'never trust, always verify.' Traditional network security assumed that anything inside the corporate perimeter was safe; zero trust abandons that assumption entirely. Every request for access — whether from an employee laptop, a cloud workload, or an API call — must be authenticated, authorised, and validated before it is permitted, and access is granted only to the minimum resources required for the task.
The model emerged because the classic perimeter has dissolved: staff work from home, applications live in the cloud, and attackers frequently move laterally once inside a network. Zero trust counters this by treating every connection as potentially hostile. Core pillars include strong identity verification (multi-factor authentication), device health checks, micro-segmentation of networks, and continuous monitoring for anomalous behaviour.
For consumers, zero-trust thinking translates to practical habits: using unique passwords and MFA on every account, never assuming a secured Wi-Fi network is safe, and treating unexpected access requests with suspicion.
Examples
- An organisation implements zero trust so that even an employee already logged into the VPN must re-authenticate with MFA before accessing payroll data.