The document provides a brief history of zero trust, tracing its evolution from traditional network security models to its current prominence. It highlights key milestones, including the introduction of firewalls in 1987, the birth of the zero trust model by John Kindervag in 2010, and Zscaler’s pioneering cloud-delivered zero trust solution. The adoption of zero trust principles has been accelerated by NIST’s framework in 2020 and the U.S. government's mandate for federal agencies by 2024. The concept has evolved into modern security strategies like Secure Access Service Edge (SASE) and Security Service Edge (SSE).

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