Why It Matters
The old approach of securing a network perimeter and trusting everything inside it no longer works. Employees work from home, business applications run in the cloud, and attackers who breach one part of a system can move laterally to reach more valuable targets. Zero trust limits that lateral movement. Even if an attacker compromises one set of credentials, they cannot automatically access other systems because each resource demands its own verification. For business owners, zero trust reduces the blast radius of a security incident. It also fits remote and hybrid working well, where employees access company systems from many locations and devices that a traditional perimeter cannot protect.
Example
A company moves to a zero trust model. When an employee logs in from their office laptop, they authenticate with their password and a second factor. They can access their email and project management tool. When they try to access the finance system, they are prompted to verify again because finance data carries a higher sensitivity classification. If they connect from an unrecognised device, access is restricted to read-only until the device is verified. An attacker who steals the employee’s email credentials cannot pivot to the finance system because the finance system does not trust the email session.
For more definitions like this, see the Digital Royalty glossary.
