The Paradigm Shift: From Castle-and-Moat to Zero Trust Edge For decades, the standard for enterprise security was the "castle-and-moat" model. This architectural philosophy assumed that anything inside the network perimeter was inherently trustworthy, while everything outside was potentially malicious. However, the explosion of the Internet of Things (IoT) and the decentralization of the workforce have rendered this model obsolete. In a modern enterprise environment, the perimeter has dissolved. The 'edge' is no longer a fixed point; it is everywhere—from the smart thermostat in the boardroom to the industrial controller on the factory floor. Implementing Zero Trust for IoT requires a fundamental reassessment of how we handle identity and access. In a Zero Trust Architecture (ZTA), the default posture is 'never trust, always verify.' This applies to every user, every device, and every network packet.…