Zero Trust: Never Trust, Always Verify
Zero Trust assumes no user or device is safe by default, even on a 'trusted' corporate network. It's like needing a keycard for every door, not just the front gate. The biggest mistake is thinking you can buy a 'Zero Trust' product; it's a strategic.
WHY IT EXISTS The traditional 'castle-and-moat' security model, where everything inside the network perimeter is trusted, is broken. With remote work, cloud services, and personal devices, the perimeter has dissolved. There is no longer a clear 'inside' versus 'outside', making perimeter-based trust assumptions dangerous.
THE MENTAL MODEL Think of a modern high-security building, not a medieval castle. In a castle, once you're past the moat and walls, you can roam freely. In the modern building, your keycard is checked at the front door, the elevator, your floor's entrance, and your office door. Every access request is individually authenticated and authorized, regardless of where it originates. This is the 'never trust, always verify' principle.
HOW IT WORKS Zero Trust is a strategy, not a single product. It is implemented by combining several techniques. Key components include: strong identity and access management (IAM) with multi-factor authentication (MFA); verifying device health and compliance before granting access; micro-segmentation to limit lateral movement if a breach occurs; and enforcing least-privilege access so users and applications only have the permissions they absolutely need. Every request is logged and inspected.
WHEN TO USE IT It should be the default security strategy for any new system. It is especially critical for organizations with a remote workforce, heavy reliance on cloud services (IaaS, PaaS, SaaS), and 'bring your own device' (BYOD) policies. It is the modern approach to securing distributed systems.
WHEN NOT TO USE IT The principles are universally applicable, but full implementation can be complex and costly to retrofit onto legacy, monolithic systems. It is not a switch to be flipped. A 'big bang' rollout is often a mistake; instead, it should be adopted incrementally, focusing on the most critical assets first. The main barrier is complexity, not a lack of applicability.
ONE CANONICAL EXAMPLE Google's BeyondCorp is the poster child for Zero Trust. Google moved its internal applications to the public internet, securing them not with a VPN or private network, but by verifying user and device credentials for every single request. This allows their employees to work securely from any network without a traditional VPN.
Read the original → en.wikipedia.org
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