Zero Trust Architecture: Rethinking Perimeter-Based Security Models

Abstract

With the dissolution of traditional network perimeters due to cloud adoption, remote work, and mobile endpoints, Zero Trust Architecture (ZTA) has emerged as a foundational security paradigm. This paper explores the core tenets of ZTA—least privilege access, continuous verification, and micro-segmentation—and how they are implemented in real-world enterprise networks. It reviews technologies like identity-aware proxies, software-defined perimeters, and secure access service edge (SASE). Case studies illustrate how ZTA reduces lateral movement and improves breach containment, making it a strategic necessity for modern organizations.