The traditional approach to security is perimeter-based. Organizations would secure their network perimeter and, once inside a datacenter, users, devices, workloads, and apps would be trusted by default. However, this approach has become outdated as organizations move away from centralization to distributed services in the cloud, and adopt mobile / remote working. This opens up a host of potential vulnerabilities.
Zero-trust is a significant departure from traditional security models, which rely on perimeter-based defenses. In these models, security is focused on protecting the network perimeter, with the assumption that everything inside the perimeter is trusted. However, with the rise of cloud computing, mobile devices, and remote work, the traditional perimeter-based approach is no longer sufficient. Zero-trust architecture is designed to provide a more comprehensive approach to security that addresses the challenges of modern computing environments.
At its core, zero-trust security is about creating a security model based on the principle of: never trust, always verify. All users and devices, whether inside or outside of your network, are considered potentially hostile and must be authenticated and authorized before they are allowed to access any resources.