GSMK Gesellschaft fuer Sichere Mobile Kommunikation mbH
- Marienstrasse 11, 10117 Berlin, Germany
- +493024625000
- sales@gsmk.de
- www.gsmk.de
Description
GSMK is a cyber security pioneer and a leader in mobile security. As a trusted partner for military and governmental customers, GSMK delivers end-to-end COMSEC and EW solutions, ranging from mobile terminals certified for classified communications to systems for the identification of COMSEC and EW threats, as well as systems for protecting mobile core network infrastructure.
We develop, produce and market:
• GSMK CryptoPhone: secure communication systems, providing the gold standard in end-to-end voice and message encryption trusted by customers worldwide for more than two decades
• GSMK Overwatch: distributed EW sensing systems for the detection, identification and localization of threats, including drones and IMSI catchers
• GSMK Oversight: intrusion detection and analytics systems for the protection of critical mobile core network infrastructure
GSMK is a 100% privately owned German company with 23 years of experience and a broad portfolio of patents covering secure communications, mobile device security and electronic countermeasures. Our solutions are deployed in more than 50 countries, serving international institutions as well as governmental and non-governmental organizations.
We develop, produce and market:
• GSMK CryptoPhone: secure communication systems, providing the gold standard in end-to-end voice and message encryption trusted by customers worldwide for more than two decades
• GSMK Overwatch: distributed EW sensing systems for the detection, identification and localization of threats, including drones and IMSI catchers
• GSMK Oversight: intrusion detection and analytics systems for the protection of critical mobile core network infrastructure
GSMK is a 100% privately owned German company with 23 years of experience and a broad portfolio of patents covering secure communications, mobile device security and electronic countermeasures. Our solutions are deployed in more than 50 countries, serving international institutions as well as governmental and non-governmental organizations.
Download
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2026-GSMK-CryptoPhone-Portfolio.pdffile size: 3.59 MB
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GSMK-Overwatch-Brochure.pdffile size: 460.28 KB
Products
GSMK CryptoPhone
GSMK CryptoPhone
Classified Communication. Everywhere. Across Network Borders.
GSMK CryptoPhone secure communication systems, the gold standard in end-to-end voice and message encryption for more than two decades.
GSMK CryptoPhone
- Proven crypto engine with redundant symmetric algorithms
- Independently verifiable source code
- No metadata
- Not visible as voice communication
- Only 4.8kbps data stream
- Unaffected by protocol and port filtering measures
- Patented Baseband Firewall
Central management of closed user groups on redundant CryptoPhone infrastructures and resilient operation of end-to-end encrypted terminals.
Unified device management for governments
- On-premise Group Manager system for large device fleets
- Comprehensive functionality for closed user groups
- Unified central management of secure mobile and desktop terminal fleets
- Tailored to military and governmental needs with correct mapping of command chains and privileges / roles for dedicated information silos
Carrier-grade reliability, scalability and redundancy
- CryptoPhone IP switching infrastructure implemented 100% in Erlang, all infrastructure elements scalable to multiple hardware nodes per element
- System state held in distributed database that can be spread across multiple hosts via VPN interconnects
- Changes on running server software applicable at runtime without stopping productive operations
Unified device management for governments
- On-premise Group Manager system for large device fleets
- Comprehensive functionality for closed user groups
- Unified central management of secure mobile and desktop terminal fleets
- Tailored to military and governmental needs with correct mapping of command chains and privileges / roles for dedicated information silos
Carrier-grade reliability, scalability and redundancy
- CryptoPhone IP switching infrastructure implemented 100% in Erlang, all infrastructure elements scalable to multiple hardware nodes per element
- System state held in distributed database that can be spread across multiple hosts via VPN interconnects
- Changes on running server software applicable at runtime without stopping productive operations
GSMK Overwatch
GSMK Overwatch
GSMK Overwatch is an autonomous, distributed system for real-time detection and localization of airborne drones and rogue cellular base stations (IMSI-catchers). It restores sovereignty over national airspace and mobile networks by generating a continuously updated situational picture and alerting the officer in charge before threats can cause widespread damage. Combat-proven for over a decade across multiple countries and continents, GSMK Overwatch is operationally deployed in several NATO member states in Europe and North America, reliably detecting illegal foreign and domestic threats that no other system was able to identify.
- Distributed, autonomous sensor network for continuous, wide-area monitoring of airspace and RF spectrum
- Detects and localizes: UAV/drone activity and IMSI-catchers / rogue mobile base stations
- Real-time automatic threat detection, classification and localization
- Continuously updated national/regional situational picture
- Instant alerting of officer in charge
- Reliable identification of attacking systems with data for immediate localization
- Field-proven for 8+ years across multiple countries and continents
- Operationally deployed in multiple NATO member states (Europe & North America)
- Scalable architecture, from local site protection to national-level situational awareness
- Detects and localizes: UAV/drone activity and IMSI-catchers / rogue mobile base stations
- Real-time automatic threat detection, classification and localization
- Continuously updated national/regional situational picture
- Instant alerting of officer in charge
- Reliable identification of attacking systems with data for immediate localization
- Field-proven for 8+ years across multiple countries and continents
- Operationally deployed in multiple NATO member states (Europe & North America)
- Scalable architecture, from local site protection to national-level situational awareness
Business sector
Border Guards special equipment
Radio- and opto-electronical equipment
Communication and IT
Brands
CryptoPhone
Oversight
Overwatch