The perimeter is dead. In a world of cloud, remote work, and sophisticated threats, zero trust is the only viable security model.
Core Principles
**Never trust, always verify**: Every request must be authenticated and authorized, regardless of source.
**Least privilege access**: Users and systems get minimum permissions needed, nothing more.
**Assume breach**: Design as if attackers are already inside. Limit blast radius.
Implementation Phases
### Phase 1: Identity Foundation Centralize identity. Implement MFA everywhere. Establish strong authentication.
### Phase 2: Device Trust Ensure only compliant devices can access resources. Implement endpoint detection.
### Phase 3: Network Segmentation Micro-segment networks. Implement software-defined perimeters.
### Phase 4: Data Protection Classify data. Implement encryption. Deploy DLP controls.
Zero trust is a journey, not a destination. Start where you have the most risk and iterate.