In today’s complex cyber landscape, securely transferring data across networks of varying security classifications is not just a technical challenge; it’s a business and operational imperative. At Nexor, we specialise in delivering cross domain solutions (CDS) that enable safe, policy-enforced communication between sensitive and non-sensitive environments, without compromising confidentiality, integrity, or availability.

Whether you're operating in defence, central government, or critical national infrastructure, secure information exchange is at the core of maintaining operational effectiveness, and this is where Nexor’s CDS expertise comes into play.

What is a cross domain solution?

A cross domain solution is designed to enforce the controlled flow of data between separate security domains, for example, between SECRET and OFFICIAL networks. These solutions apply data validation, sanitisation, and policy enforcement to ensure only authorised, clean information is exchanged.

Unlike firewalls or standard gateways, CDS from Nexor goes beyond network-level controls to offer deep content inspection, protocol breaks, and rigorous assurance, delivering the highest levels of security for mission-critical environments.

Why do cross domain solutions matter?

Organisations handling classified, sensitive, or regulated data cannot afford uncontrolled network interconnectivity. Yet the need to share intelligence, disseminate insights, or collaborate securely remains constant.

Nexor’s CDS solutions help to:

• Prevent unauthorised data release and protect classified information

• Support compliance with government and MOD security policies

• Facilitate secure collaboration between trusted and untrusted domains

• Eliminate risky manual processes, such as USB data transfers

Our solutions are National Cyber Security Centre (NCSC) aligned and developed following secure by design principles, ensuring confidence at every level.

Who needs a cross domain solution?

CDS are mission-critical for organisations where network segregation is enforced, but data sharing is still essential. Typical Nexor customers include:

•  UK Ministry of Defence and armed forces

•  Intelligence and law enforcement agencies

•  Cabinet Office and central government

•  Critical national infrastructure providers

•  Aerospace, defence and secure supply chain partners

These sectors rely on Nexor’s assured cross domain technologies to protect national interests while enabling the controlled flow of data.

How do Nexor’s cross domain solutions work?

At the heart of our CDS deployments is a secure boundary that manages data transfer between differing domains. Our systems:

• Enforce unidirectional or bidirectional information flow, based on need

• Apply content filters, data diodes, and protocol breaks

• Carry out metadata inspection, virus scanning, and content sanitisation

• Provide granular audit logs to meet assurance and compliance requirements

Our Nexor GuarDiode and Nexor Guardian products, for instance, provide high-assurance, accredited capabilities used across the UK public sector.

Typical CDS Use Cases

• Intelligence sharing: Redacting and sanitising data for dissemination from classified to open networks

• Mission planning: Transferring maps or reconnaissance from secure systems to mobile platforms

• International collaboration: Safely bridging the policies between agencies to ensure secure intel sharing between allies and partners. 

• Public-private coordination: Sharing incident data securely between government and private sector partners

With decades of experience, Nexor enables these use cases through trusted, accredited solutions developed in the UK and deployed globally.

Why choose Nexor for cross domain solutions?

As a trusted provider to the UK government, MOD, and NATO, Nexor has a proven track record in delivering secure information exchange solutions that meet the highest assurance levels.

Our credentials:

• UK sovereign solutions

• NCSC-aligned and CAPS-recognised technologies

• Experience across defence, national security, and infrastructure

From initial risk assessment through to solution architecture, implementation, and support, Nexor delivers secure by design.

The future of secure information exchange

With the rise of hybrid working, cloud adoption, and emerging threats, cross domain security must evolve. Nexor is investing in cloud-ready CDS, Zero Trust architectures, and automation-enhanced filtering to support the next generation of secure collaboration wherever the mission demands it.

Ready to secure your data?

For organisations where information assurance is critical, CDS is not a luxury; it’s a necessity. Nexor’s cross domain solutions are designed to enable mission success through secure communication.

Contact our security specialists to explore how Nexor can support your secure data transfer needs.