Cybersecurity Companies

Arqit Quantum

London, United Kingdom commercial

Arqit Quantum (Nasdaq: ARQQ) is a London-based quantum encryption technology company founded in 2017, publicly listed via SPAC merger in 2021, that has pivoted from satellite-based quantum key distribution (QKD) to software-defined symmetric key encryption — now positioned as a provider of post-quantum cryptography solutions for government, enterprise, and critical infrastructure customers seeking to protect data against future attacks from quantum computers capable of breaking current RSA and elliptic curve cryptography. Arqit's original business concept was satellite-mediated QKD: launching satellites equipped with photon sources to distribute quantum encryption keys to ground stations using the fundamental physics of quantum mechanics (where any eavesdropping on photon transmission disturbs the quantum states, making interception detectable). Two quantum key distribution satellites were built with the European Space Agency and QinetiQ Space, but Arqit sold that business in May 2023 and the remaining contracts were transferred away in September 2024; it no longer has a satellite programme. However, the company pivoted substantially from hardware QKD to software-based key agreement protocols, repositioning its QuantumCloud product as a symmetric key agreement system that can run on conventional infrastructure without satellite hardware dependency — a dramatically faster path to commercial deployment than manufacturing and launching dedicated quantum satellites. The QuantumCloud service generates symmetric encryption keys (which quantum computers cannot break more effectively than classical computers, unlike asymmetric public key cryptography) through a software key derivation protocol, delivering these keys to devices via an authenticated cloud service. This approach is marketed as 'quantum safe' because it does not rely on factoring-hard or discrete-log-hard mathematical problems that quantum Shor's algorithm breaks. The target use cases include government secure communications (agencies planning for post-quantum migration compliance with NIST PQC standards), enterprise VPN and cloud security, 5G network security, and critical infrastructure protection. Arqit has faced significant scrutiny from short-sellers and analysts questioning the technical feasibility claims and financial sustainability of the original satellite QKD concept, contributing to a dramatic decline in stock price from peak SPAC valuations. The company's ~$200M market cap reflects ongoing investor skepticism. Competitors in post-quantum cryptography solutions include PQShield, evolutionQ, CryptoNext Security, and the major cloud providers (AWS, Azure, Google) implementing NIST-standardized PQC algorithms.

General Dynamics Space & Mission Systems

Scottsdale, United States defense contractor

General Dynamics Mission Systems is a major defense contractor with significant space operations. The company builds ground systems for satellite constellations, secure communications systems for military space operations, and space-qualified electronics. General Dynamics provides command and control systems for the US Space Force, processes satellite data for intelligence agencies, and manufactures radiation-hardened electronics for space applications. The company also supports the Space Development Agency's proliferated LEO constellation program.

CYSEC

Lausanne, Switzerland commercial

CYSEC is a Lausanne, Switzerland-based cybersecurity company founded in 2018 specializing in hardware-rooted security solutions and post-quantum cryptography specifically designed for the space industry's unique threat environment — providing secure computing platforms, cryptographic key management systems, and communication security products for satellite command and control, satellite data links, and space system ground segment infrastructure. Space systems face a distinctive cybersecurity challenge: satellites cannot be physically patched or hardware-updated once launched, command link intrusion can result in catastrophic mission loss or weaponization of the spacecraft, and the RF communications links used for satellite TT&C are inherently broadcast and interceptable over wide geographic areas. Traditional IT security approaches (frequent software updates, hardware replacement, centralized patch management) do not apply in the space environment where each spacecraft must be secured for a 10-15 year operational lifetime against threats that will evolve significantly over that period. CYSEC's core product is the ARCA Trusted Computing Platform — a radiation-tolerant secure processor module that provides hardware-rooted trust anchors, secure boot attestation, cryptographic key generation and storage in hardware security modules (HSMs), and authenticated encryption for satellite command uplinks and data downlinks. The hardware security module approach means cryptographic keys are generated and never leave the secure hardware boundary, preventing key extraction even if the satellite's onboard computer is compromised through software vulnerabilities. Post-quantum cryptography implementation is central to CYSEC's product roadmap: current asymmetric encryption (RSA, ECC) used for satellite command authentication is vulnerable to quantum computer attacks using Shor's algorithm, and satellites being designed today will still be operational when sufficiently powerful quantum computers may exist. CYSEC implements NIST-standardized post-quantum algorithms (CRYSTALS-Kyber for key encapsulation, CRYSTALS-Dilithium for digital signatures) in its hardware security modules, providing forward security for satellite command systems against future quantum threats. CYSEC has received ESA funding through OSIP (Open Space Innovation Platform) and commercial contracts for European satellite programs. The company competes with traditional defense cryptography suppliers (Thales, L3Harris, Rohde & Schwarz) and emerging space security specialists (Axiom Space/NASA security frameworks) in the space cybersecurity niche. The EU's NIS2 Directive and growing regulatory focus on space infrastructure protection are expanding the addressable market.

ManTech

Herndon, United States commercial

ManTech is a technology solutions provider focused on national security, serving the Defense, Intelligence, and Federal Civilian sectors. Founded in 1968 and headquartered in Herndon, Virginia, the company delivers capabilities in areas including cybersecurity, data and artificial intelligence (AI), and digital engineering. ManTech emphasizes a mission-centric approach, integrating emerging technologies with deep operational experience to address complex challenges for its clients. Key technological strengths lie in full-spectrum cyber capabilities, AI integration for efficient mission success, and support for hybrid multi-cloud IT solutions through a state-of-the-art software factory. Recent news highlights include the acquisition of Elder Research, strengthening ManTech’s position in the data and AI space. ManTech positions itself as a leader in delivering “game-changing” solutions at the speed of mission, with a core competitive advantage stemming from its highly skilled workforce and leadership—recognized by Glassdoor as a 2024 ‘Top 50 Best-Led Company’. The company’s focus is on empowering clients to navigate unfamiliar territory and maintain superiority in increasingly complex operational environments.

NSSLGlobal is a leading independent full-service satellite systems integrator with over 55 years of experience, originally founded in 1969. The company specializes in designing, integrating, and managing complex communication and navigation systems for a diverse range of sectors including maritime, energy, media, enterprise, and government/defence. NSSLGlobal doesn’t simply provide hardware; they offer end-to-end solutions encompassing network design, cybersecurity, crew welfare applications, and digital transformation support. Their core capabilities lie in integrating cutting-edge satellite technology with deep engineering expertise, working with major satellite providers and manufacturers globally. Solutions include VSAT marine broadband, smart navigation systems, push-to-talk services, tracking solutions, and a centralized management portal (INSIGHT) for data and bandwidth oversight. NSSLGlobal has a strong focus on secure and resilient communications, particularly for defence, government, and responder organizations, offering tailored solutions for use at sea, on land, and in the air. Notably, NSSLGlobal actively participates in industry events, such as the upcoming Public Security Exhibition (PSE) in October 2025, and demonstrates commitment to social responsibility through initiatives like supporting Macmillan Cancer Support. Their long-standing presence in the maritime sector, exceeding five decades, positions them as a trusted partner for organizations seeking comprehensive and integrated satellite communication solutions.

QuantumCTek, founded in 2009 and based in Hefei, China, is a pioneering company focused on the development and commercialization of quantum technologies, specifically within the realm of satellite communications. As China’s first publicly-traded company in the quantum technology sector, QuantumCTek represents a significant national investment in this emerging field. The company’s core business centers around leveraging quantum key distribution (QKD) to enhance the security of communication networks. While specific technological details are limited in publicly available information, QuantumCTek’s focus on QKD indicates expertise in photonics, cryptography, and potentially advanced materials science. QKD utilizes the principles of quantum mechanics to generate and distribute encryption keys, offering theoretically unbreakable security against eavesdropping attempts – a critical advantage for sensitive communications. Their work in satellite communications suggests development of technologies for transmitting these quantum keys over long distances, overcoming the limitations of terrestrial fiber optic networks. As a first-mover in a strategically important technology area for China, QuantumCTek is positioned to serve government, military, and potentially commercial clients requiring the highest levels of data security. The company’s public listing signals strong state backing and a commitment to scaling its technologies for wider deployment. Given the nascent stage of the quantum communications market, QuantumCTek’s unique value proposition lies in its early entry and established position within the Chinese ecosystem. This allows them to capitalize on growing demand for secure communications infrastructure and potentially establish a leading role in the global quantum communications landscape.

SpiderOak

Mission, United States commercial

SpiderOak is a Mission, Kansas cybersecurity company (founded 2007, originally known for privacy-preserving cloud storage) that pivoted to space systems cybersecurity with its OrbitSecure platform. OrbitSecure implements zero-trust security architecture for satellite communications and space ground systems — preventing command injection attacks, protecting data-in-transit between spacecraft and ground stations, and enabling secure multi-party access for satellite constellations with multiple operators or customers. The space cybersecurity market has grown significantly as satellite operators face increasing nation-state and criminal cyber threats and as regulations (CISA, FCC) begin requiring demonstrated cybersecurity controls for satellite operators. SpiderOak was selected for ESA's InCubed (Investing in Industrial Innovation) program, validating its technology for European satellite applications. The company targets both commercial satellite operators and government/defense customers.

ViaSat Government Systems, founded in 2010 and based in Carlsbad, United States, is a provider of secure communications solutions for government clients. The company focuses on delivering global, mobile connectivity across all domains – air, land, sea, cyber, and space – supporting modernization efforts and addressing evolving operational challenges. ViaSat Government distinguishes itself through an end-to-end portfolio encompassing satellite constellations, ground systems, cybersecurity, and associated technologies like antenna systems and network management. Key capabilities include secure satellite access with high availability (99.9%), paired redundancy, and automatic backup switching, enabling customized solutions for government needs. They offer solutions for Beyond Line of Sight (BLOS) communications on the move, situational awareness, command and control, and Intelligence, Surveillance and Reconnaissance (ISR). With over 35 years of experience building and protecting global communication infrastructures, ViaSat Government emphasizes proactive cybersecurity and data protection. The company positions itself as a “mission partner” rather than a traditional defense contractor, leveraging commercial experience and extensive research and development to deliver innovative solutions. While specific customer details are not publicly available, ViaSat Government serves a broad range of government entities including the military, heads of state, civil governments, and emergency responders.

KETS Quantum Security

Bristol, United Kingdom commercial

KETS Quantum Security, founded in 2016 and based in Bristol, UK, develops chip-based quantum security solutions designed to protect against emerging threats like quantum computing and AI. The company focuses on two core technologies: Quantum Key Distribution (QKD) and Quantum Random Number Generators (QRNG). QKD enables the secure distribution of cryptographic keys using the principles of quantum mechanics, while QRNG generates truly unpredictable random numbers for enhanced security applications. KETS offers both full-system and sub-system products, targeting sectors including defense, finance, critical infrastructure, and telecommunications. Specific use cases highlighted include hardening satellite communications, securing naval networks, upgrading telecommunication networks, and enhancing encryption algorithms. The company recently secured a £1.7m contract funded by Innovate UK to accelerate development of its next-generation QKD solution and has partnered with CryptoNext Security to build comprehensive quantum-safe solutions. KETS positions itself as a provider of scalable, compact, and energy-efficient quantum security, addressing a growing need for proactive measures against future quantum computing capabilities. Through thought leadership and active development, KETS aims to remove key barriers to the adoption of quantum encryption technologies and prepare organizations for a “quantum-safe” future.