Today marks an important milestone for Sirius. Arqit has announced a strategic investment in our company, building on an established partnership and supporting the next stage of our development.

For Sirius, the investment represents an opportunity to accelerate work already underway, expand our engineering capabilities and bring our technology to more defence, intelligence and government customers.

It also reflects something we've believed since founding the company: that secure computing and communications can be significantly simpler, more adaptable and more accessible than the systems traditionally used in demanding operational environments.

Building for the environments that matter #

Sirius was founded to address a persistent challenge in defence and national security technology. Organisations increasingly depend on connected devices, distributed systems and information sharing across networks they don't necessarily own or control. Yet the technologies used to secure those communications are often expensive, complex to deploy and difficult to adapt to changing operational requirements.

Those limitations become particularly apparent at the tactical edge, where connectivity may be unreliable, infrastructure is constrained and users cannot afford to spend time managing complicated security systems.

We believe secure communications should work with the equipment and networks organisations already have, rather than requiring them to replace infrastructure or fundamentally change how they operate.

That philosophy underpins Crux, our flagship secure networking platform.

Crux provides lightweight, quantum-safe communications across mobile devices, computers and embedded systems. Designed to operate across diverse networks and environments, it enables organisations to establish secure connectivity between distributed teams, systems and platforms without depending on extensive dedicated infrastructure.

From the outset, we've looked for the problems that other vendors pass over, and focused on building technology that can move beyond demonstrations and into the hands of people who need it.

A partnership built on complementary capabilities #

Our relationship with Arqit began with a shared understanding of the challenges facing defence and government organisations as they prepare for the post-quantum era. We saw how Arqit's key technology could become a product that people in the field can pick up and use. That product became Crux.

Arqit brings advanced encryption technologies designed to protect sensitive information against current and future threats. Sirius brings adaptable secure networking capabilities that can operate across heterogeneous devices, platforms and communications infrastructure.

Together, these technologies provide an approach to quantum-safe communications that combines strong encryption with practical deployment.

Our joint offering integrates Crux with Arqit's Sovereign Key Platform and NetworkSecure technologies, allowing organisations to extend quantum-safe protection across existing networks and devices.

Importantly, this is not simply a future capability. Our partnership has already delivered solutions into operational environments, demonstrating the value of combining advanced encryption with lightweight, software-based networking.

The relationship has also created new opportunities for both companies, particularly as defence and government organisations look to modernise their communications infrastructure and prepare for the transition to post-quantum encryption.

Today's investment builds on that foundation.

Accelerating our development #

The investment will support several areas of Sirius's continued development.

Our immediate priority is to accelerate the engineering and development of Crux, expanding its capabilities across platforms and operational environments while continuing to improve how it integrates with existing infrastructure.

We will also advance our broader portfolio of secure computing and networking technologies, including hardware built for specific jobs at the edge, where general-purpose equipment falls short.

This combination of software and hardware development is central to our longer-term direction. We see considerable opportunity in bringing secure communications, computing and network capabilities closer to where information is generated and used, particularly in environments where conventional infrastructure cannot be assumed.

Alongside our product development, we will deepen our technical integration with Arqit's encryption technologies and explore new joint products and services.

The investment also gives us the resources to grow our engineering team and strengthen the foundations needed to support larger deployments and more demanding customer requirements.

Building for the long term #

Although Sirius remains an early-stage company, we've made considerable progress in developing our technology, establishing commercial partnerships and building the foundations for sustainable growth.

Our approach has always been grounded in practical engineering. We develop technologies around real operational requirements, with an emphasis on reliability, adaptability and ease of deployment.

We've also continued to build our presence across the United States, United Kingdom and Germany, reflecting both the international nature of our team and the markets we serve.

Earlier this year, Sirius was named a finalist in the Startup in Cyber category at the National Cyber Awards, recognition that was particularly welcome for a small team working to establish itself in a demanding industry.

As we enter this next phase, our priorities include expanding the engineering team, strengthening our product development capabilities and continuing to invest in the assurance and operational maturity our customers expect.

The Arqit investment provides an important foundation for that work.

Looking ahead #

The requirements facing defence and national security organisations are changing rapidly.

Greater reliance on autonomous systems, distributed operations and multinational cooperation is increasing the need for secure communications that work across different devices, networks and national boundaries.

At the same time, the transition to post-quantum encryption presents an opportunity to reconsider how those communications are secured, deployed and managed.

We believe the answer lies in technologies that are easier to integrate, simpler to operate and capable of adapting to the environments in which they're needed.

Our partnership with Arqit has already demonstrated what can be achieved by combining complementary technologies and expertise. With this investment, we have an opportunity to build on that work at a significantly greater scale.

We're grateful to Arqit for its confidence in Sirius, to the customers and partners who have supported our development, and to the team whose work has brought us to this point.

We're looking forward to what we find next.

Read the full announcement from Arqit →