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The zero trust security model , sometimes known as perimeterless security, describes an approach to the design and implementation of IT systems. The main concept behind the zero trust security model is "never trust, always verify,” which means that devices should not be trusted by default, even if they are connected to a permissioned network such as a corporate LAN and even if they were previously verified. Most modern corporate networks consist of many interconnected zones, cloud services and infrastructure, connections to remote and mobile environments, and connections to non-conventional IT, such as IoT devices. The reasoning for zero trust is that the traditional approach — trusting devices within a notional "corporate perimeter", or devices connected via a VPN — is not relevant in the complex environment of a corporate network. The zero trust approach advocates mutual authentication, including checking the identity and integrity of devices without respect to location, and providing access to applications and services based on the confidence of device identity and device health in combination with user authentication.
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