Zero Trust Security

Overview

Zero trust shifts emphasis from a trusted internal perimeter to resource-focused policy. Access decisions consider identity, device, service, requested resource, context, risk, and policy, with authentication and authorization performed before a session or action is allowed.

The model does not mean distrusting every user equally, repeatedly interrupting all work, or buying one product. Weak identity, unmanaged devices, broad service accounts, missing asset inventories, poor telemetry, and legacy dependencies can undermine zero trust despite network segmentation or branding.

Organizations should inventory resources and data flows, strengthen identities and devices, apply least privilege, separate policy decisions from enforcement, monitor sessions, and automate revocation. Migration should follow risk and operational readiness, with measured outcomes, recovery paths, and controls for unavailable dependencies.

For Zero Trust Security, production scope should name the relevant subjects, authenticators, credentials, roles, policies, sessions, devices, resources, and recovery channels, the decision being supported, the accountable owner, and the time and jurisdiction boundaries.

Zero Trust Security is a security mechanism or control discipline that assumes no implicit trust from network location or ownership and requires explicit, continuously evaluated access decisions for protected resources. Zero Trust Security decisions should preserve authoritative evidence, timestamps, accountable ownership, exceptions, and the final security, compliance, or financial outcome. Zero trust replaces location-based assumptions with explicit resource access decisions grounded in identity, device, context, least privilege, telemetry, and continuous evaluation.

A production treatment of Zero Trust Security should test the requirement for explicit, continuously evaluated access decisions for protected resources within the relevant asset, decision, or service state. The Zero Trust Security context record for explicit should preserve source data, configuration or policy version, responsible actor, exception, and outcome. Review of Zero Trust Security should determine whether safeguards addressing explicit changed exposure in practice, not merely whether a document or setting existed.