Communications defence companies in Denmark

Ishøj company making SRoC ruggedised ground control stations, swappable radio modules and Optroxa gimbal cameras for military drones and ground robots. Founded in 2014 and headquartered in Denmark and the United States.

Danish quantum communications company building QKD systems for quantum-secure key exchange over existing fibre networks, including defence and government deployments.

Builds the Arbit Data Diode and Trust Gateway for cross-domain network segmentation, certified to Common Criteria EAL7+ and accredited for NATO COSMIC TOP SECRET and EU TOP SECRET data transfer. Founded in Hvidovre in 2006.

Arbit Data Diode 10 GbE

Hardware data diode that moves data from an open network into a closed one over a single fibre-optic link that can only send light in one direction, with two dedicated servers acting as sender and receiver. It supports mail, file shares, FTP, REST and video or radio streaming, and is certified to Common Criteria EAL7+.

Arbit Trust Gateway 10 GbE

Gateway for exporting data from high to low security networks, built to replace manual transfers by USB stick. Two data diodes in series create an isolated zone that holds configuration and program code as read-only, and the gateway checks content, authenticates the source and can require approval from a releasing officer.

C4ISTAR Gateway

Cross-domain gateway for importing and exporting data between security domains, sold in a server room version and a ruggedised version with NATO standard connectors for vehicle mounting. It supports NATO releasing and clearing officer functions, signature checks, SitaWare integration and national security profiles that customers can build themselves through an open API.

Danish company developing standardised physical and digital interfaces that let navies plug mission modules, sensors and uncrewed systems into any ship, sold as the ModuLink, ModuHub and ModuFleet products. Signed a memorandum of understanding with Babcock in August 2026 on hybrid naval capabilities.

Brøndby company that makes Dencrypt Connex, end-to-end encrypted voice, video and messaging for defence, government and business users. Terma agreed to acquire it in August 2026.

Aalborg operator building a VDES (AIS 2.0) network of low Earth orbit satellites and ground stations that gives maritime authorities, coast guards and ship owners secure ship-to-shore data links.