Zero Trust
Never trust automatically. Verify continuously. The best defense against external and internal threats.
What Is Zero Trust?
Zero Trust is a security model built around one principle. Never grant trust automatically. Verify it continuously instead.
NIST SP 800-207 defines the approach at the federal level. Rather than defending a network perimeter and trusting whatever sits inside it, Zero Trust protects individual resources, applications, and data directly. Every request for access gets evaluated on its own, based on who or what is asking, the health of the device involved, and the context of the request.
Older models assumed that anything inside the network could be trusted once it got past a firewall. Zero Trust starts from the opposite assumption. An attacker could already be inside, so every request gets checked, every time.
The Pillars of Zero Trust
CISA's Zero Trust Maturity Model organizes the approach into five pillars. The DoD Zero Trust Strategy uses a related seven-pillar model for defense components, built on the same core ideas.
Identity
Verifying who or what is requesting access, continuously, not just once at login.
Devices
Checking device health and compliance before letting a device reach your resources.
Networks
Segmenting and encrypting traffic instead of trusting anything already inside the network.
Apps and Workloads
Securing access to individual applications and services rather than the network they run on.
Data
Protecting data based on its sensitivity and context, wherever it is stored or sent.
Visibility and analytics, automation and orchestration, and governance run underneath all five pillars, tying identity, device, network, application, and data controls into one system instead of five disconnected ones.
Zero Trust and CMMC
CMMC does not explicitly require the term Zero Trust. It requires specific NIST SP 800-171 controls, and several of those controls line up directly with Zero Trust principles.
| NIST 800-171 Family | Zero Trust Principle |
|---|---|
| Access Control | Identity based segmentation limits access to only what a user or device needs |
| Identification and Authentication | Continuous verification and multi factor authentication instead of a single login check |
| System and Communications Protection | Encrypted traffic regardless of whether it originates inside or outside the network |
| Audit and Accountability | Granular logging of every access decision, not just perimeter events |
The Department of Defense has set a target of full Zero Trust adoption across its components. For contractors, treating CMMC and Zero Trust as one connected effort tends to go further than working on each separately.
Who Needs Zero Trust?
A few situations tend to bring organizations to a Zero Trust conversation.
Relying on a perimeter model that trusts anything already inside the network
Supporting remote or hybrid teams accessing resources from outside a traditional office network
Preparing for CMMC or working under DoD Zero Trust expectations
Wanting to limit the damage a compromised or misused internal account could do
What Sentinel Blue's Zero Trust Work Includes
We build Zero Trust across identity, devices, and network access, and connect it to the monitoring and compliance work already running in your environment.
Identity and access management, including conditional access and multi factor authentication
Device compliance and posture checks before granting access
Network segmentation to limit how far an attacker can move if they get in
Continuous monitoring through Sentinel Blue's in-house SOC and XDR deployment
Documentation mapping your Zero Trust controls to CMMC and NIST 800-171 requirements
Zero Trust Is a Program, Not a Setting
A Zero Trust rollout that stops at configuring a few settings tends to fall apart the first time someone asks for proof that it works. Sentinel Blue treats Zero Trust as an ongoing program, not a one time project.
Sentinel Blue is a CMMC Third-Party Assessment Organization with CMMC Certified Assessors on staff, so the documentation behind your Zero Trust controls gets built with an assessor's expectations in mind, not written after the fact to match what was already deployed.
We also run our own in-house Security Operations Center and support Microsoft Defender based XDR, so the monitoring layer that Zero Trust depends on is not outsourced to a separate vendor.
Turning on multi factor authentication is a start, not a finished Zero Trust architecture. Our role is to build the identity, device, network, and monitoring pieces together and keep them working as your environment and staff change.
PSI Pax
PSI Pax spent years preparing for CMMC before failing a gap assessment. Sentinel Blue rebuilt the environment in a clean GCC High enclave, tightened identity and access controls, and supported PSI Pax through its CMMC Level 2 assessment on the first try.
"This was something I'd been sweating about for three years. We were done on the first day." Debra Hill-Cherry, CIO, PSI PaxRead the PSI Pax Case Study →
Zero Trust FAQ
Zero Trust is a security model defined in NIST Special Publication 800-207 that removes automatic trust from users, devices, and network locations. Every request for access is verified based on identity, device health, and context, whether it comes from inside or outside the network.
CMMC does not explicitly require the term Zero Trust. It requires specific NIST SP 800-171 controls, and a Zero Trust architecture directly supports several of them, including access control, identification and authentication, system and communications protection, and audit and accountability.
CISA's Zero Trust Maturity Model organizes Zero Trust into five pillars (identity, devices, networks, applications and workloads, and data), supported by cross-cutting capabilities in visibility and analytics, automation and orchestration, and governance. The DoD Zero Trust Strategy uses a related seven-pillar model for defense components.
No. Zero Trust is an architecture and an operating approach, not a single tool or product. It is built using a combination of identity management, device compliance, network segmentation, and monitoring, configured to work together.
Zero Trust removes the assumption that anything inside the network can be trusted. Access is limited to what a user or device needs, and activity is continuously verified rather than trusted after an initial login, which reduces the damage a compromised or misused internal account can do.
Ready to Stop Trusting by Default?
If your organization needs a Zero Trust architecture that holds up under a CMMC assessment, not just a checklist of settings, talk with Sentinel Blue.