The Zero Trust Model: Why Trust No One Has Become the Foundation of Digital Security As corporate environments expand and cloud infrastructure becomes the norm, the physical boundaries of traditional perimeter security—which assumed everyone inside the network was inherently trustworthy—have dissolved. This shift driven by remote work and cloud adoption rendered the castle-and-moat strategy obsolete, giving rise to the Zero Trust architecture built on the fundamental principle of Never Trust, Always Verify This framework enforces continuous, explicit authentication for every access request regardless of its origin, evaluating user identity, device health, and context in real time. Access is strictly limited through the principle of least privilege, granting individuals only the minimal permissions required for their immediate tasks. By operating under an assume breach mindset, organizations micro-segment their networks to restrict lateral movement, effectively mitigating insider threats and containing ransomware attacks to maintain operational continuity.