Zero Trust security: Core principles explained

While the traditional approach to network security assumes that everyone inside the network is trustworthy, Zero Trust gives no one an easy pass. Here, every access attempt-internal or external-is treated as potentially risky and must be carefully verified. This helps ensure that only authorized users can access company resources.

Key takeaways

• The Zero Trust security model assumes that no user or device can be automatically trusted and requires all of them to be authenticated.
• Traditional perimeter-based security is becoming increasingly outdated due to increasing IoT devices and insider threats, with Zero Trust architecture offering a more dynamic solution.
• To enhance security, Zero Trust limits employee access to only necessary resources, thus minimizing potential breaches by applying least privilege access.
• The Zero Trust model uses automation for efficient authentication and response, and dynamic policies tailored to organizational risks.
• Key pillars of Zero Trust include workforce, device, workload, network, data security, visibility and analytics, and automation and orchestration.
• Zero Trust is a comprehensive framework guiding IT security, not just a product or specific protocol.

What is Zero Trust?

Zero Trust is a security framework in which no user or device-inside or outside the network-is automatically trusted. It therefore requires all user identities and devices to be continuously authenticated before being given access to company resources.

The Zero Trust approach helps solve some of today's biggest IT security challenges, especially as users now connect from both on-premises and remote locations. In large, complex networks, relying on a single layer of authentication is no longer enough-this is where a Zero Trust architecture makes a real difference. It streamlines network management and ensures proper authorization for remote employees, keeping hybrid cloud environments secure.

For this reason, Zero Trust is gaining traction and is poised to replace traditional perimeter-based security models. These older models assumed that devices and users inside the organization's LAN were safe from external threats. However, the rise of IoT devices-often beyond the control of network administrators-and the growing risk of insider threats have changed the cybersecurity landscape. Zero Trust helps mitigate these risks by denying every connection by default until it is verified.

Of course, Zero Trust isn't just about blocking everyone. Transitioning to the Zero Trust security model is a multi-stage process that requires careful planning and implementation. Its principles need to be applied thoughtfully, taking into account the realities of a business's actual network and operations.

What are the core principles of Zero Trust security?

The phrase most often associated with Zero Trust is "never trust, always verify," which serves as its guiding principle. It captures the main idea behind Zero Trust-never assuming any user or device can be inherently trusted and always verifying access.

Beyond this general concept, the Zero Trust model is built on a set of principles that inform its implementation. These principles are detailed in NIST (National Institute of Standards and Technology) Special Publication 800-207, widely regarded as the most neutral and adaptable framework for organizations aiming to strengthen their security posture.

Here are the key Zero Trust principles outlined by the publication.

Continuous verification

The Zero Trust approach discards the idea of safe internal and unsafe external networks. All networks must be considered untrustworthy regardless of their location, as threats could be lurking in all of them. The focus should shift to the connections themselves and find ways how each could be verified before granting access.

Therefore, the Zero Trust approach requires inspecting every incoming connection and asking for authorization. That way, your employees may have to authenticate more frequently, protecting the enterprise from more threats. While it is a less conventional approach, the price of a data breach is too high to compromise your cybersecurity.

Limit the blast radius

The assumption that your employees are one of the main threats to your cybersecurity is one component of the Zero Trust model. Employee data mismanagement is a serious risk that can bypass even your cutting-edge cybersecurity measures. It's also very easy to overlook due to the huge scope of internal data and the number of employees, especially in large organizations.

For this reason, Zero Trust recommends granting only limited access to every employee. Using least privilege access, employees should only be given access to the resources needed for their job. This limits employees' privileges, but it also contains the damage that could be caused if their credentials were exposed.

Automate context collection and response

Zero Trust encourages security streamlining and can be made more effective by automatizations. User-approved log-ins aren't a viable option if every user needs to be authenticated and reauthorized. This can be automated by analyzing specific connection traits as an additional precaution. If the user connects from a different location and its device's ID doesn't match, it can be automatically detected.

However, detection is only half the battle. Upon identifying an anomaly, the system must respond swiftly-denying access and alerting IT administrators. Automated responses help maintain network integrity, allowing human intervention only for more complex cases. Organizations should choose the best ZTNA solutions to automate responses quickly and accurately.

Resource-centric protection

Zero Trust shifts away from the traditional method of network segmentation to focus on safeguarding individual resources. Rather than assuming that all devices within a specific network zone are trustworthy, each asset, service, workflow, and account must be independently secured and verified.

This principle is crucial in today's interconnected environments, where resources may exist across various locations and platforms, such as cloud environments. The goal is to ensure that security policies follow the resource wherever it goes, protecting it from unauthorized access and potential threats, regardless of its network environment. By treating every resource as vulnerable, organizations can enhance protection and minimize risks.

Device and user authentication

In the Zero Trust model, continuous device and user authentication is essential to prevent unauthorized access. This principle recognizes that traditional security models, which rely on network location or physical presence to determine trust, are no longer sufficient. With the rise of remote work, BYOD (bring-your-own-device) policies, and cloud-based services, device and user authentication must be consistently applied, regardless of where a user connects from.

Each session requires validation to ensure that credentials and devices are secure. By employing rigorous and continuous verification, Zero Trust eliminates any assumption of implicit trust, providing a stronger defense against potential breaches and compromised credentials.

Implement dynamic policies

Automation and authentication requirements have to be built on a solid foundation of well-defined security policies. These policies serve as the blueprint for your cybersecurity strategy, providing a clear overview of how security measures will be implemented and managed.

To determine how much flexibility or strictness your policies should have, you must assess the risks specific to your organization. For instance, if you handle sensitive, regulated data, you'll need to introduce stricter controls. The industry you operate in can also play a major role in shaping these policies. Careful evaluation of these factors will help tailor Zero Trust security to your company's unique needs.

Foundational pillars of Zero Trust Security

It's important to realize that Zero Trust isn't a product or a detailed outline of how your cybersecurity should be set up. Zero Trust is a concept that describes how IT network components in an organization should be treated. The framework is composed of a combination of practices that increase the organization's cybersecurity.

Workforce security

Zero Trust aims to increase internal workforce security via authentication and access control. Each user that accesses the network has to be verified by the standard set by a security policy. This guarantees minimal access conditions and checks for any suspicious data that could pose a risk to the organization if such a connection is allowed. It's a method to limit the surface area for cyber attacks.

Device security

A well-rounded organization's security is impossible without strong device security. Allowing unsupervised or unauthorized devices inside your network is playing with fire. Thorough identification and authorization should be applied in all cases to prevent unsecured device access.

Workload security

All work-related IT inventory, from hardware devices to software applications, constitutes the backbone of most modern businesses. Therefore, security is one of the most important aspects of each used IT asset. As unauthorized data collection and tampering are significant threats, workload security is one of the most fundamental Zero Trust pillars.

Network security

As the data leaves users' devices and is exchanged online, its security is one of the main aspects of adopting the Zero Trust framework. Microsegmentation of an organization's internal data helps to set clear boundaries and seals sensitive resources from unauthorized access.

Data security

An organization's data should be classified to know how much sensitive data an organization oversees. The access policies should be adjusted so that only those needing access for their job role could access the most sensitive documents. However, the files should always be stored securely - using encryption while the data is transferred and stored.

Visibility and analytics

Monitoring is a central component of IT security maintenance. It's a part of the cybersecurity setup that ensures access control and segmentation rules are followed. Some of these policies' regulations can be automated if predetermined parameters are set. The end goal is to increase network visibility without leaving any unsupervised endpoints.

Automation and orchestration

A network administrator should be able to control organizations' connectivity from a single dashboard. The point is to have a centralized control hub from which cloud storage and access can be managed.

Best practices for Zero Trust security

Although implementing a Zero Trust architecture may sound like a highly complex process, it really comes down to a few straightforward steps. Most of these can be handled through a single tool, such as NordLayer, allowing you to modernize your security without unnecessary friction. Here's how to put a Zero Trust model into practice within your organization.

• Verify every user and device: Implement additional authentication measures such as multi-factor authentication (MFA) or single sign-on (SSO) to prevent unauthorized access.
• Check device security posture: Ensure every device meets your security standards before granting access. This may include verifying antivirus protection, operating system version, and compliance with your internal policies.
• Adopt the principle of least privilege: Assign permissions based on job roles so users can access only the resources they need. Regularly review permissions and remove access that is no longer required.
• Segment your network: Divide your network into separate zones for teams or applications, and apply specific access rules for each segment to control who can reach what.
• Monitor and log activity: Track how users and devices interact with your systems to detect unusual behavior early and address issues before they escalate.
• Keep all systems up to date: Regularly update software and devices to close known security gaps and reduce the risk of attacks exploiting outdated systems.

Zero Trust security with NordLayer

NordLayer offers a Security Service Edge solution within the broader Secure Access Service Edge framework. Built on Zero Trust principles, it helps small and medium businesses strengthen their security posture without added complexity.

Ensuring secure remote access from any location, with a strong focus on strict authentication and authorization, NordLayer is a powerful addition to your cybersecurity strategy. As a fully cloud-based service, it can be managed entirely through the web dashboard-no hardware deployment required.

As a software-only service, NordLayer provides outstanding scalability, requiring only two simple steps for deployment: accepting the invite link sent by email and downloading our easy-to-use application.

Get in touch with our team and discover more about our approach that could improve your organization's cybersecurity.