Menu

Contact us

We are your ServiceNow partner for strategic consulting

Zero Trust Architecture

Picture of Sebastian Leinhos
Sebastian Leinhos

Managing Director

Zero Trust Architecture is one of the most important approaches modern cybersecurity. It helps companies manage access in distributed IT infrastructures in a more controlled, traceable, and risk-aware manner.

  • Last updated: 06/11/2026
  • Called 37 times.
Programming code on computer screen
Table of Content
Request for Proposal - Key Takeaways
In a zero-trust architecture, every access is verified based on identity, device, context, and risk.

For companies, Zero Trust is becoming important because cloud, remote work, mobile devices, and external partner access are dissolving traditional security perimeters.

In practice, Zero Trust combines explicit verification, least privilege, multi-factor authentication, Zero Trust Network Access, and continuous monitoring.
ServiceNow creates transparency over assets, structures access processes, connects security workflows, and makes governance more traceable.

What is the Zero Trust model?

The Zero Trust model is a modern enterprise security model where no user, no device, and no access is automatically trusted. The principle is: never trust blindly, always verify.

Sebastian Leinhos
Previously, security was largely thought of in terms of the corporate network. Those within the network were considered secure. In a Zero Trust Architecture (ZTA), the specific context of each request determines, no longer just the location.

For example, it is checked who wants to access which data, applications, or resources. Also Devices, roles, permissions and potential risks are taken into account in the assessment. Only then is access granted, restricted, or blocked.

Why Traditional Security Models Are Reaching Their Limits in Modern IT Environments

The outdated security model worked like a castle wall. What was outside was controlled, what was inside was trusted. But with Home office, cloud computing, mobile devices and external partner access, this clear boundary is hardly present anymore.

In today's IT world, applications run in the cloud, data is distributed, and users access resources from different locations. If an attacker steals credentials or compromises a device, he can move around too freely in traditional networks.

The Zero Trust approach moves security closer to users, devices, applications, and data. This provides greater control in distributed IT environments and a solid foundation for secure IT transformation.

Successfully shaping IT transformation!

Modernize your IT landscape, digitize processes and create the technological foundation for sustainable growth and innovation.
👉 Get a no-obligation consultation now
IT transformation

The 3 Most Important Zero-Trust Principles

Zero Trust is based on three basic principles: Every access is explicitly checked., Rights are limited to the necessary minimum and Potential attacks are taken into account from the very beginning.

Verify explicitly

Zero Trust assumes that every access request should be treated as a potential threat until it is authenticated and verified. Every access request is re-checked, even if it comes from the office or a known network.

For the decision, the overall picture of the user, device, access location, application, authorization status, and current risk assessment is crucial. The location can provide clues, but it does not replace an examination.

Grant minimal rights

users, devices, and systems receive only the Rights they need for their current assignment. This principle of least privilege reduces the potential damage if an account is compromised.

Access is restricted as much as possible, often also for a limited time via just-in-time access. This way, administrative rights do not remain permanently active, and attackers find fewer open paths through the infrastructure.

Assume a security breach

Zero Trust accounts for attacks from the very beginning. The Zero Trust security model assumes that cyberattacks are already taking place and that protection must therefore be effective even within the network.

The core is damage control.. Network segmentation, microsegmentation, and continuous monitoring prevent attackers from moving undetected from system to system. This approach is particularly well-suited to modern security strategies and also strengthens a Information Security Management System (ISMS), because risks are identified, limited, and documented earlier.

Zero Trust Security: The Key Building Blocks of a Zero Trust Architecture

Zero Trust security arises from the Interplay of multiple components. Identities, access, devices, applications, data, and network segments must be managed together for the architecture to function in everyday use.

Identities and Multi-Factor Authentication

The identity of each user must be clearly examined, before access to resources is granted. Multi-factor authentication supplements the password with app verification, biometrics, or hardware tokens. This means stolen credentials alone are less likely to be sufficient for a successful attack.

Central identity management is also important. Roles, permissions, and accounts must remain up-to-date. Former employees, outdated group rights, or permanently active admin accounts do not fit a robust Zero Trust strategy.

Zero Trust Network Access (ZTNA) as an access layer

Zero Trust Network Access, or ZTNA for short, controls access to applications much more granularly than traditional VPN models. After a successful verification, a user receives only access to precisely that application, ...that he needs for his task.

Internal applications remain harder to find from the outside. ZTNA establishes connections precisely, encrypted, and on a session-by-session basis. Access then follows clear zero-trust policies instead of blanket access controls.

Zero-Trust Network Architecture and Segmentation

A zero-trust network architecture restricts movement within the infrastructure. The network is divided into smaller, logically separate segments, so that a compromised device cannot gain unrestricted access to critical systems.

This network segmentation is primarily against Lateral Movement important. This makes it more difficult for ransomware or other cyber threats to spread from a workstation to databases, servers, or central services.

The protection arises from clear rules at the application level and between individual segments. Only explicitly permitted communication is allowed. Everything else remains blocked or is subject to additional scrutiny.

Continuous monitoring of devices, applications, and data

A successful login is not sufficient for permanent access in a ZTA. Devices, applications, data streams, and behavior must be monitored on an ongoing basis.

This includes the device status. Encryption, the latest security updates, and active security software all play a role in determining whether an endpoint is granted access. A seamless Patch Management ensures that outdated endpoints and servers are detected and secured more quickly.

Unusual API calls, large data transfers, or suspicious logins can be signs of data breaches or active attacks. With IT Monitoring such signals become apparent and can be translated into action more quickly.

The biggest challenges in implementing zero-trust architecture

Zero Trust sounds simple in theory. In practice, however, it becomes challenging as soon as you have to sort through legacy applications, established access rights, and external access. On this topic should a zero-trust roadmap clarify early, which areas should be secured first and where the greatest risks lie.

Common obstacles include:

  • Legacy IT as a hindrance: Older applications rarely support modern access controls, multi-factor authentication, or dynamic policies. These systems require special protective measures, appropriate solutions, or a clean replacement.

  • Acceptance in everyday work: Zero Trust should not come across to employees as constant mistrust. If logins, approvals, and security checks become too complicated, workarounds and shadow IT will emerge.

  • External Partners and Supply Chains: Many organizations work closely with service providers, platforms, and partners. Third-Party Risk Management helps to controlledly assess external access and demonstrably limit risks.

  • Zero Trust starts too late: Anyone who only starts looking for suitable security solutions after purchasing software often buys problems along with it. Even in the Request for Information (RFI) and Request for Proposal (RFP) should include requirements for ZTNA compatibility, interfaces, and granular permissions.

Making the Zero Trust concept operationally manageable with ServiceNow

Zero Trust makes sense in theory, but in practice it results in a lot of approvals, security alerts, exceptions, and decisions. Without centralized control, things can quickly become confusing.

ServiceNow is this central control and helps to, to translate the Zero Trust concept into operational processes. About IT Operations ManagementITOM) and the CMDB becomes visible which devices, applications, services, and dependencies are affected. This contextual data helps to specifically apply Zero Trust policies and correctly assess risks.

At the same time, IT Service Management (ITSM)ITSM) and Service Request Management (SRMStructure in access processes. Permissions can be requested, reviewed, approved, and provided for a limited time. This keeps rights more closely tied to specific tasks.

Security incidents can also be better translated into measures.. Recognizes the Vulnerability Management a critical vulnerability, can Security Operations (SecOps) derive prioritized workflows. About Integrated Risk Management (IRM) and the Information Security Management System risks, controls, and evidence are additionally documented.

Advantages of a Zero Trust Architecture

A zero-trust security architecture strengthens security through more precise access and earlier risk mitigation.

The most important advantages at a glance:

  • Reduced risk from compromised accounts: Even if access credentials are stolen, attackers do not gain free access to resources. Rights remain limited and tied to specific applications.

  • Less damage from attacks: Microsegmentation and continuous testing make lateral movement on the network more difficult. This allows cyberattacks to be contained earlier.

  • Better security in distributed environments: Zero Trust is a good fit for mobile work, external partners, and modern hybrid cloud environments.

  • Stronger compliance and audit capability Accesses, decisions, and security events are documented in a more traceable manner. This supports requirements from NIS2, DORA, and a modern ISMS.

  • More efficient IT operations Automated approvals, clear workflows, and central transparency relieve security and IT teams.

Frequently asked questions and answers

What is the Zero Trust principle?

The Zero Trust principle follows the guideline „Never trust blindly, always verify“. For modern network security, this means that every access request is checked against identity, device, context, and risk. The fundamental assumption is that threats exist both outside and inside the network can be found, which is why internal access is also continuously monitored and verified.

The modern Zero Trust model was primarily driven by Who developed the Zero Trust architecture? shaped, which the development of the concept 2010 at Forrester Research made it known. In parallel, Google, with „BeyondCorp,“ early on adopted a similar approach to enable secure work without a classic VPN perimeter. Since then, numerous other companies and organizations adopted and further developed the concept, so that Zero Trust is now considered a widespread security standard.

Zero Trust disadvantages lie in the implementation, because existing systems, old permissions, and manual approval processes need to be cleanly adapted. Without a clear roadmap, automation, and good user guidance, Zero Trust can quickly become complex and slow down employees. In addition, the introduction often requires significant fifinancial and human resources, which can be a major hurdle, especially for smaller businesses.

The zero-trust architecture can be flexibly to various industries adapt, especially in areas where information security and data privacy are paramount. In the financial services sector, it increases the security of transactions and data access through continuous access controls. Government institutions are using Zero Trust architecture to protect classified military information and national security secrets.

 
Zero Trust facilitates compliance with regulatory requirements, such as GDPR, through detailed logs and access histories, by enabling continuous verification of user and device identities, a proactive response to threats and offering enhanced Visibility and control over network traffic, so that potential threats can be detected more quickly.

Do you have any questions?

We are happy to help you! Contact us and find out how you can drive your IT transformation forward efficiently.
👉 Request advice now!