Galileo OSNMA Launches to Counter GNSS Spoofing Threats

Cybersecurity Galileo OSNMA launches to counter growing GNSS spoofing threats

2025-09-16 Source: EUSPA 1 min Reading Time

With cyber and hybrid threats on the rise, Europe’s Galileo OSNMA service introduces the world’s first free, open authentication for satellite navigation signals, strengthening resilience for aviation, transport, energy, and critical infrastructure.

An OSNMA-capable receiver retrieves the OSNMA dedicated fields in the navigation message and processes these data to determine whether it is authentic.(Source: EUSPA) — An OSNMA-capable receiver retrieves the OSNMA dedicated fields in the navigation message and processes these data to determine whether it is authentic.
(Source: EUSPA)

As spoofing and jamming incidents against Global Navigation Satellite Systems (GNSS) continue to rise across Europe, the European Commission has officially launched Galileo’s Open Service Navigation Message Authentication (OSNMA), a free service enabling users to verify the authenticity of Galileo navigation messages.

OSNMA is designed to counter spoofing attacks, where fake signals mislead navigation systems, and complements wider measures against jamming, which disrupts GNSS reception. With aviation, shipping, energy networks, and financial transactions increasingly dependent on satellite timing and positioning, OSNMA represents a major step towards securing Europe’s critical infrastructure.

Spoofing and jamming incidents have grown sharply in recent years, with thousands of cases reported monthly across Poland, Lithuania, and the Baltic region, often affecting commercial aviation. Low-cost spoofing devices, widely available online, have made it easier than ever to target critical systems.

“OSNMA gives users a way to verify that the data they receive is authentic and unchanged,” said EUSPA Executive Director Rodrigo da Costa. “It raises the barrier for attackers and strengthens trust in Galileo signals across sectors which depend on them.”

The service works by embedding cryptographic signatures into Galileo navigation messages, allowing receivers to detect counterfeit or replayed signals. It is the first time a global navigation system has provided such authentication openly and free of charge to civilian users.

Operational since 24 July 2025, OSNMA is already being integrated into international aviation standards, EU-mandated smart tachographs for road transport, and maritime navigation systems. Energy and finance sectors are also expected to benefit, as timing authentication helps secure power grids and financial transactions against signal manipulation.

Looking ahead, Galileo plans further upgrades, including signal-level authentication and integration with its Public Regulated Service (PRS) and next-generation satellites, reinforcing Europe’s position as a leader in GNSS resilience.

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