John Kindervag outlined the Zero Trust security model a decade ago. He says the model is widely deployed in some of the world’s most secure environments. The NSA has provided guidance on Zero Trust from their perspective recently. He advises organizations to go through these five deployments steps to build Zero Trust networks: Define Your Protect Surface, Map the Transaction Flows, Maintain the environment and Automate the Gather and automate responses in the event of a massive attack center on the attack surface.
Source: https://www.helpnetsecurity.com/2021/04/06/john-kindervag-zero-trust/