Why Zero Trust?
The traditional "castle-and-moat" security model assumes everything inside the network is trusted. This is dangerously outdated. Zero Trust assumes breach and verifies every request — regardless of whether it originates inside or outside the network.
Core Principles
- Verify Explicitly: Always authenticate based on all available data points — user identity, device health, location, service, data classification.
- Least Privilege Access: Limit user access with just-in-time and just-enough-access (JIT/JEA). Micro-segment networks.
- Assume Breach: Minimize blast radius. Segment access. Use end-to-end encryption. Analytics for threat detection.
Implementation Steps
Start with identity: deploy MFA everywhere, implement SSO with conditional access policies. Then network: micro-segment your infrastructure so each service only communicates on required ports. Finally data: classify sensitive data and apply DLP (Data Loss Prevention) policies.
Tools for Zero Trust
Cloudflare Access, Google BeyondCorp, Azure AD Conditional Access, and open-source options like Teleport and Keycloak provide zero trust capabilities without requiring a complete infrastructure overhaul.