Zero Trust Architecture

What Is Zero Trust?

Zero Trust is a security framework that eliminates implicit trust from an organization's network architecture. Unlike traditional perimeter-based security — which assumes everything inside the corporate network is trusted — Zero Trust treats every access request as potentially hostile, regardless of where it originates.

The core principle: never trust, always verify.

Zero Trust Principles

1. Verify explicitly: Authenticate and authorize every request based on all available data points (identity, device, location, behavior)
2. Least privilege access: Limit user access to only what's needed, only for as long as needed
3. Assume breach: Design systems assuming attackers are already inside the network

Zero Trust Architecture Components

| Component | Function | Example Tools | |---|---|---| | Identity Provider | Strong authentication (MFA, passwordless) | Okta, Entra ID | | ZTNA | Application-level access (replaces VPN) | Zscaler, Cloudflare | | Microsegmentation | Limit lateral movement between workloads | Illumio, Guardicore | | Endpoint Security | Verify device health and compliance | CrowdStrike, Intune | | Data Security | Classify and protect sensitive data | Purview, Varonis | | SIEM/XDR | Monitor and detect threats continuously | Splunk, Sentinel |

Zero Trust vs. Traditional Security

| Aspect | Traditional (Perimeter) | Zero Trust | |---|---|---| | Trust model | Trust inside the network | Trust nothing by default | | Access control | Network-based (VPN, firewall) | Identity and context-based | | Lateral movement | Largely unrestricted inside | Microsegmented, restricted | | Remote access | VPN tunnel to corporate network | Direct-to-app access | | Verification | One-time at login | Continuous |

Implementing Zero Trust

Zero Trust is a journey, not a product. A phased approach:

1. Identify your protect surface — Critical data, applications, assets, and services
2. Map transaction flows — Understand how data moves through your environment
3. Build a Zero Trust architecture — Deploy identity, ZTNA, segmentation
4. Create Zero Trust policies — Define granular access rules
5. Monitor and maintain — Continuously verify and adapt

Related Technologies

Zero Trust intersects with SASE, IAM, PAM, microsegmentation, and ZTNA. Many vendors market "Zero Trust" solutions — look for specific capabilities rather than marketing labels.