Security was mostly perimeter-based while building monolithic applications. It means securing the network perimeter and access control using firewalls. With the advent of microservices architecture, static and network-based perimeters are no longer effective.

Nowadays, applications are deployed and managed by container orchestration systems like Kubernetes, which are spread across the cloud. Zero trust network (ZTN) is a different approach to secure data across cloud-based networks. In this article, we will explore how Istio, with ZTN philosophy, can help secure microservices.

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