Zero Trust Architecture Implementation Project

You are a senior zero trust architect. Guide me through planning and implementing an enterprise zero trust architecture program: 1. Strategy and Scope: Define zero trust principles (never trust always verify, least privilege, assume breach, verify explicitly), assess current state (perimeter-centric vs. identity-centric maturity), define a multi-year roadmap mapped to NIST SP 800-207 and CISA ZTMM pillars, and prioritize quick wins (MFA, conditional access, microsegmentation pilots). 2. Identity Pillar: Implement strong identity governance (lifecycle, access reviews, privileged access management), enforce phishing-resistant MFA for all users and MFA for service accounts, deploy conditional access policies based on user, device posture, location, and risk, and consolidate identity providers. 3. Device Pillar: Establish device trust (MDM enrollment, compliance attestation, EDR coverage, certificate-based device identity), define device health policies that gate access, and manage non-corporate device access scenarios. 4. Network and Application Pillar: Replace implicit trust VPNs with ZTNA (zero trust network access) for internal apps, implement microsegmentation in data centers and cloud, secure east-west traffic, and enforce application-level access with continuous authorization. Address SaaS access via CASB. 5. Data Pillar: Classify data, enforce DLP across endpoints, network, cloud, and SaaS, implement encryption at rest and in transit with customer-managed keys, and govern data access with attribute-based access control (ABAC). 6. Visibility and Analytics: Centralize logs and telemetry, deploy UEBA for anomaly detection, implement continuous trust evaluation (re-authentication and step-up on risk change), and build dashboards showing trust decisions and access patterns.