Zero Trust

Zero Trust is a security concept based on the principle of "never trust, always verify." No user, device, or application is automatically considered trustworthy — even if it is already inside the internal network. Rather than relying on classic perimeter security, which treats everything within the corporate network as safe, Zero Trust requires explicit verification of identity, device state, and context with every access attempt.

The core mechanism of Zero Trust is continuous authentication and the principle of least privilege. Every access request is evaluated dynamically based on factors such as user identity, device configuration, location, and behavioral patterns. Technologies such as multi-factor authentication, conditional access, and microsegmentation ensure that users can only access the resources they actually need for their specific task.

A typical use case involves companies with many field staff who access corporate data daily from different devices and locations. School authorities managing tablets and laptops across multiple school sites also benefit from the Zero Trust approach, as devices only gain access to sensitive systems when they are demonstrably configured securely. Public authorities and government institutions use the concept to meet regulatory requirements such as the NIS2 Directive or the GDPR in a structured manner.

A key advantage of Zero Trust is the reduction of the blast radius in the event of an incident. Even if a device or user account is compromised, strict access controls prevent attackers from moving laterally through the network and accessing further resources. This makes Zero Trust one of the most effective strategies against modern threat scenarios such as ransomware or insider attacks.

Implementing Zero Trust starts at the device level, as only endpoints that are demonstrably compliant with defined security policies are granted access to corporate data. How this can be consistently achieved within a GDPR-compliant IT infrastructure is described there in detail.