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Emily Wearmouth and Ben Morris explore the challenges of protecting international sports events where cybersecurity meets physical security.

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Making Sense of Zero Trust Through the Lens of Networking and Infrastructure

Oct 20 2022

“Zero trust” still confuses people—and for good reason. While the term conveys a certain absolute authority (“zero,” “nope,” “nothing”), contemporary approaches offer much more nuanced capabilities. And while zero trust today is typically associated with security initiatives, the concepts have their origin in the definition of network perimeters, who is granted access, and how that access is provided.

The evolution of security hasn’t been from implicit trust to no trust, but rather toward contextual controls that grant the right people the right access to the right resources at the right time for the right reasons. But ultimately, making sense of zero trust requires an understanding of how the role of networking and infrastructure has shifted with respect to the critical objectives of security in recent years.

The changing role of the network: a brief history

In the earliest days of building networks and defining the enterprise perimeter, all companies were essentially islands. They built corporate networks to facilitate interactions between employees and data that was all on-premises. When the internet came along, everyone wanted to get in on that. But businesses realized fairly quickly that the internet’s default implicit trust was going to cause problems when it came to protecting themselves from outsiders with malicious intent. 

The first natural step was to use the network to create demarcation points. Architectures evolved to include something called a DMZ, which has a similar function as physical-world demilitarized zones (such as the 2.5-mile wide strip of land between North Korea and South Korea; the natural isolation of which created an involuntary park now regarded as one of the most well-preserved areas of temperate habitat in the world). This kind of “castle and moat” architecture actually worked for a long time. But then as businesses evolved and required constant connectivity with other businesses, partners, suppliers, and even their own customers in certain circumstances—new patterns were required 

There were many attempts at creating these new patterns over the years. The Jericho Forum promoted de-perimeterization in the early 2000s. A few years later, I wrote about “the death of the DMZ” and delivered some Microsoft TechEd presentations where I advocated to authenticate every person and system, authorize all actions and behaviors, audit every activity and transaction, and encrypt where necessary. (Though today, I would change that last one to encrypt all the time.)

Then zero trust networking came along. This was useful—but it was still thinking more along the lines of gating access to networks. Google’s BeyondCorp initiative proposed “What if people were always on the internet, even if they’re in the office?” They really only get an internet connection; all requests to interact with applications must flow through some kind of a broker. Then Forrester’s Zero Trust eXtended (ZTX) came along. Gartner offered their own early take on the concept, which was called CARTA  (continuous adaptive risk and trust assessment). 

Then the emergence of the software-defined perimeter architecture made the zero trust concept much more relevant. The software-defined perimeter hooked people to applications—regardless of what the underlying network infrastructure was like. This opened up new possibilities. 
As a result, the zero trust network access (ZTNA) market soon emerged. Right now, we’re seeing a lot of emphasis on ZTNA—which came out of COVID, when everyone suddenly ha