Zero Trust Network Access Blueprint

Zero Trust Architecture Framework — Enterprise Implementation Blueprint

After leading Zero Trust transformation at Lockheed Martin across 14 classified enclaves, I built this framework to solve the problem most security teams hit at month three: you have a NIST SP 800-207 PDF, a Zscaler license, and no idea how to sequence micro-segmentation across 400 legacy VLANs without breaking production.

This framework addresses the core architectural gap that allows lateral movement after initial access — the technique behind 78% of breaches in the 2025 Mandiant M-Trends report. Traditional perimeter models fail because they implicitly trust east-west traffic. CVE-2024-3400 (Palo Alto PAN-OS) demonstrated that even your firewall can become the pivot point when trust is assumed at the network layer.

What You Get

• Policy Decision Point (PDP) Architecture Templates — Terraform modules for deploying PDP/PEP patterns on AWS (Verified Access), Azure (Conditional Access + Private Link), and GCP (BeyondCorp Enterprise). Each module includes IAM policy documents, not just network diagrams.
• Micro-Segmentation Runbook — 47-page step-by-step for brownfield environments. Covers discovery (using Illumio or Guardicore flow maps), policy modeling in enforcement-off mode, graduated enforcement by application tier, and rollback procedures when a segmentation rule breaks a legacy SOAP service.
• Identity-Centric Access Policies — 22 Conditional Access policies for Azure Entra ID and 18 AWS IAM Identity Center permission sets, mapped to NIST SP 800-207 Section 3 trust algorithm inputs: device health, user risk score, network location, and resource sensitivity.
• Continuous Verification Detection Rules — 35 Sigma rules and 12 KQL queries for detecting trust boundary violations: impossible travel, token replay, lateral movement via service accounts, and anomalous east-west traffic volume.
• CIS Benchmark Overlay — Maps each CIS Controls v8 safeguard (IG2 and IG3) to specific Zero Trust implementation steps in this framework.

Implementation Sequence for Brownfield Environments

Phase 1 (Weeks 1-4): Deploy identity provider hardening — enforce phishing-resistant MFA (FIDO2), disable legacy authentication protocols, establish device trust posture checks. Phase 2 (Weeks 5-10): Implement application-level micro-segmentation starting with crown jewel systems (databases, CI/CD pipelines, secrets managers). Phase 3 (Weeks 11-16): Enable continuous authorization with runtime risk scoring and automated session revocation. Phase 4 (Weeks 17-20): Extend to OT/IoT segments using network-based enforcement where agent deployment is impossible.

What This Framework Does NOT Cover

This framework does not cover physical security controls, social engineering awareness training, or vendor-specific SASE product configuration beyond the three major clouds. It assumes you already have a functioning identity provider (Entra ID, Okta, or Ping) and basic network visibility.

Audit Evidence Generated

Produces artifacts that directly satisfy NIST SP 800-207 Section 7 assessment criteria, FedRAMP Rev 5 AC-4 and SC-7 control families, and CMMC Level 2 AC.L2-3.1.3. Auditors receive: network segmentation test results with packet captures, policy enforcement logs showing deny-by-default decisions, device compliance attestation reports, and continuous monitoring dashboards with 90-day retention proof.

Written by Kenny Ogunlowo — Detection Engineer, U.S. Secret Clearance holder. Built and operated Zero Trust architectures at Lockheed Martin and Cigna Healthcare.