What is Zero Trust?

Updated June 2026 · 5 min read

Zero trust is a security model built on one principle: never trust, always verify. No user or device is automatically trusted, even if they are already inside your network.

The old model and why it broke

Traditional network security operated on a "castle and moat" model. You built a strong perimeter (the moat) and assumed everything inside was safe. Once you authenticated to the VPN or logged onto the office network, you had broad access to everything.

This model stopped working for two reasons. First, most work no longer happens inside a perimeter. Remote work, cloud apps, and personal devices mean "inside the network" is not a meaningful security boundary anymore. Second, once an attacker gets inside the perimeter (through phishing, a compromised credential, or a vulnerable device), they can move freely.

What zero trust means in practice

Zero trust is not a single product you buy. It is a set of principles applied across your security architecture. For a small business, implementing zero trust means:

Is zero trust realistic for a small business?

Yes, in part. You do not need to implement a full enterprise zero trust architecture. But the core principles, enforced MFA, least-privilege access, device health requirements, and conditional access policies, are achievable for any business using Microsoft 365 or similar platforms.

Most small businesses we audit are missing the basics: MFA is not enforced on all accounts, former employees still have active accounts, and access to sensitive data is overly broad. Fixing those three things alone moves you significantly toward a zero trust posture.

Where to start

Start with identity. Every major breach starts with a compromised credential. Enforcing MFA across all accounts, reviewing access permissions, and setting up conditional access in your Microsoft 365 or Google Workspace tenants are the highest-impact steps for the least complexity.

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