First Steps Implementing Zero Trust

Quick Answer

• Zero Trust implementation is the process of rolling out “never trust, always verify” controls across identity, devices, network, applications and data
• Most organizations follow a phased roadmap: Assessment → Planning → Deployment → Optimization
• NIST Special Publication 800-207 provides the federal reference framework for Zero Trust Architecture
• Zero Trust is a methodology, not a single product, so most rollouts layer onto existing infrastructure rather than replacing it outright
• Maturity typically develops in stages, often described as crawl, walk, run
• Red River helps organizations assess, plan and implement a Zero Trust strategy tailored to their environment

Zero Trust is everywhere: the media, your management, 160+ OEMs who propose some form of a Zero Trust solution, government standards and now Presidential mandates. The need is genuine, the question I propose is, “Are you ready?”

Zero Trust Defined

Zero Trust is a security model based on maintaining strict access controls and not trusting anyone by default, even users already inside the network perimeter. It removes implied access and only grants trusted users the access they need to perform their job.

Zero Trust is a methodology, not a product; there’s no single infrastructure implementation or architecture that delivers a complete Zero Trust solution on its own.

As a reference model, NIST Special Publication 800-207 provides a standard Zero Trust conceptual framework that illustrates the components and functional capabilities of a typical Zero Trust Architecture (ZTA). Beyond that federal standard, OEM-specific solutions and industry analyst architectures from firms like Forrester and Gartner offer their own approaches to the same underlying principles.

Core Principles of Zero Trust, Explained

Zero Trust Architecture rests on three foundational principles. Understanding each one individually helps clarify what a real implementation actually requires.

• Verify Explicitly: Every access request is authenticated and authorized based on all available data points, identity, location, device health, service or workload and data classification, rather than trusted because it originated inside the network. In practice, this means combining multiple signals for every request instead of relying on a single username and password check.
• Least Privilege: Access is limited to what a user or system needs to complete a specific task, and nothing more, often using just-in-time and just-enough-access policies. Standing administrative privileges are one of the biggest risk factors in a breach, and least privilege access directly reduces that exposure by removing permissions that go unused.
• Assume Breach: Zero Trust designs assume that a breach has already happened or will happen, and focus on minimizing blast radius through microsegmentation, encryption and continuous monitoring rather than relying on a perimeter to keep every threat out. This shift, from prevention-only to prevention-plus-containment, is what separates Zero Trust from traditional perimeter security.

Zero Trust Roadmap: A 5-Step Implementation Framework

There are many reasons to implement Zero Trust Architecture. The more practical question is how to begin. Here’s a five-step implementation framework, often achievable with the tools you already have:

1. Embrace Zero Trust: Zero Trust has moved beyond a buzzword into a mainstream cybersecurity strategy. In 2021, the U.S. Cyber Security Executive Order required federal agencies to implement Zero Trust Architecture, and that pressure has since worked its way into the private sector. Don’t wait for a mandate to embrace the parts of a Zero Trust strategy that fit your organization today.
2. Inventory assets, identify workflows and classify by value: You can’t manage what you can’t see. Identify all software and hardware assets, capturing base functionality and ownership, then classify them by value, critical, production or general, with Zero Trust attributes tied to each tier. Map your critical business workflows so the assets supporting them are protected first, and involve business and process owners early, since their buy-in speeds up adoption significantly.
3. Create a specific plan: Start from a common Zero Trust Architecture framework, but adapt it to your organization’s specific risk profile and needs. There’s no one-size-fits-all strategy, and you’ll refine the plan as implementation progresses.
4. Keep it as simple as possible: Less is more early on. Start with three basic access groups, critical, production and general, and use your asset inventory to deploy Zero Trust in phases, prioritizing the most critical assets first.
5. Communicate the plan to all employees: Explain why the organization is adopting Zero Trust, provide basic training on the concept, and cover how employees can help and what to expect. Inclusion meaningfully improves the rate of adoption and effectiveness.

Implementation Phases

Beyond the five foundational steps above, most Zero Trust rollouts also move through four broader implementation phases:

• Assessment: Evaluate your current security posture, inventory assets and identities and map data flows to understand where sensitive information lives and how it moves.
• Planning: Define policies, prioritize which systems and users to address first, typically the highest-risk assets, and choose the architecture approach, identity-based, application-based or platform-based, that fits your environment and budget.
• Deployment: Roll out access controls, multi-factor authentication, network segmentation and monitoring tools in phases, starting with a pilot group before expanding organization-wide.
• Optimization: Tune policies continuously and automate as the program matures.

Risk Assessment

Before rolling out any Zero Trust controls, map your risks. A risk assessment identifies which systems, data and workflows are most valuable to attackers and most damaging to lose, so implementation resources go toward the highest-impact areas first rather than being spread evenly across low-risk and high-risk systems alike.

A useful risk assessment typically covers:

• Which data sets are most sensitive or regulated, and where they’re stored
• Which systems would cause the most disruption to the business if compromised, whether that’s a core application, a customer database or a manufacturing control system
• Existing vulnerabilities, like unpatched systems, or legacy apps with overly broad access
• Third-party and vendor access points into the environment

Ranking risks this way turns a vague “implement Zero Trust” mandate into a concrete, prioritized project plan.

Data Protection

Zero Trust is often described in terms of network and identity controls, but data-centric security is just as central to the model. Three practices anchor this piece:

• Encryption: Data should be encrypted both at rest and in transit, so that it is unreadable even if a system is compromised.
• Classification: Not all data carries the same risk. Classifying data by sensitivity, public, internal, confidential or restricted, lets policies apply stricter controls only where they’re actually needed.
• Data Loss Prevention (DLP): DLP tools monitor and control how sensitive data moves, flagging or blocking unauthorized transfers (e.g., email attachment or unsanctioned USB drive)

Together, these controls mean that even a successful breach doesn’t automatically translate into a successful data theft.

Network Security Through Internal Segmentation

Traditional network security focuses on the perimeter, while a Zero Trust approach focuses just as much on what happens after someone is inside. Internal segmentation, sometimes called microsegmentation, breaks the network into small, isolated zones so a compromised device or account can’t move freely to reach everything else.

In practice, this might mean isolating finance systems from general office traffic, restricting IoT and OT devices to their own segments or requiring reauthentication to move between zones.

The goal isn’t to make the network harder to use for real employees – it’s to make sure a single compromised credential doesn’t equal a compromised organization.

Cloud Security Across Azure and AWS (and Other SaaS)

Most organizations now run a mix of on-premises infrastructure and cloud platforms, and Zero Trust has to extend across both. Applying Zero Trust to cloud environments generally involves:

• SaaS applications: Enforce conditional access and continuous session verification for platforms like Microsoft 365, rather than trusting a login for its entire session.
• Azure and AWS: Apply least privilege through native IAM tools like Microsoft Entra ID or AWS IAM.
• Consistent policy across environments: The most common gap in Zero Trust rollouts isn’t the cloud platform itself. Rather, it’s the inconsistency between strict on-premises controls and looser cloud configurations that never got the same attention, which is exactly where attackers look first.

Achieving a Zero Trust Maturity Model (Crawl, Walk, Run)

Rather than implementing every piece of Zero Trust at once, most organizations mature through three broad stages:

• Crawl: Basic multi-factor authentication is deployed for high-risk accounts, an initial asset inventory is completed. In this stage, monitoring is largely manual.
• Walk: MFA and least privilege access extend organization-wide, network segmentation begins for the most sensitive systems and automated monitoring replaces manual checks.
• Run: Continuous, risk-based verification is standard across identity, device, application, network and data, AI-driven analytics inform access decisions in real time and Zero Trust extends consistently to third-party vendors and cloud workloads.

Most organizations spend months in the Crawl stage and a year or more in Walk, while Run is best treated as an ongoing state rather than a finish line.

Utilize Zero Trust OEM Solutions

There are various methods to approach a Zero Trust implementation in terms of architecture, below are a few examples in the state what’s possible and key OEMs who are proponents of their specific approach:

• Federal ZTA Standard: NIST SP 800-207, the federal standard for Zero Trust. This strategy approach has the upside of a fully structured ZTA implementation but cost, time, resources and ongoing support will be expensive and a heavy lift.
• Endpoint Based: Approaches Zero Trust from a user access perspective and security from an end point perspective. Leading OEM example of this is Crowdstrike, partnering with Akamai, Cloudflare, Google Cloud, Okta, Netskope and Zscaler, to provide a comprehensive approach.
• Identity Based: This approach is the core of a true Zero Trust Architecture implementation, utilizing user-based access management, contextual awareness and application access management to deliver a real-time functional solution. Key OEMs in the “ZTA identity based never trust, always verify, enforce least privilege approach” include OKTA, Ping Identity, SecureAuth, Google Beyond Corp, Microfocus & Cyolo for industrial OT networks.
• Application Based: Traditional security models are becoming increasingly irrelevant to today’s decoupled development. An application based Zero Trust solution places key focus on a single strong source of user identity, authorization policies to access an application and access control policies within the application. Leading OEM examples of this approach include Cisco Tetration, Ivanti, Auth0, VMware and Microsoft Azure-based services.
• Service & SASE-based: There is a growing trend to integrate Zero Trust and SASE utilizing service-based authentication and verification service to provide secure and verified access. The quick deployment and low cost start up can make this approach a very attractive option. Most often delivered as a cloud-based service approach, service providers in this space include Cato Networks, FireEye / McAfee MVISION & Secure Link.
• Platform-based: The largest and most comprehensive approach is the OEM platform direction. OEMs have committed their “integrated” solution suite ranging from end point to network to policy and management systems. While vendor lock-in is a potential concern most OEMs are including API integration and open systems to allow additional ZTA integration points. Leading OEMs in the ZTA Platform suite include Cisco, Palo Alto, Fortinet, zScaler, Forcepoint & Microsoft.

Long-Term Considerations

The Zero Trust Architecture and supported OEM solutions will continue to evolve over the next decade. It is my prediction that it will take the next three to five years before the components genuinely settle and services begin to consolidate.

There are simply too many moving parts, dynamic IT support components, shifting remote access requirements and evolving threat landscape areas that are moving faster than IT budgets can support. It will take a few in-production Zero Trust Architecture renditions before well-established best practices can be established.

With that as a background, the 160+ OEM solutions plus the ongoing marketing and business pressure to move towards ZTA, the time is now to begin your Zero Trust journey. If you need help getting started, a managed service provider and security expert like Red River can create your customized Zero Trust plan, and help you monitor, manage and implement it.

Zero Trust Implementation: FAQs