Galileo OSNMA authentication service now operational

Credit: EUSPA

The European Union Agency for the Space Programme (EUSPA) has officially declared its Galileo Open Service Navigation Message Authentication (OSNMA) initial service operational. OSNMA introduces a data authentication mechanism for Galileo Open Service users and is available free of charge to Galileo users worldwide.

Spoofing is the transmission of counterfeit satellite signals that deceive GNSS receivers, causing false, unreliable positioning that can disrupt critical sectors including transportation, finance, telecommunications, energy, manufacturing, healthcare, emergency services and law enforcement. In safety-critical domains such as aviation and maritime, spoofing risks can lead to serious safety hazards.

OSNMA addresses these threats by embedding a cryptographic digital signature within the Galileo navigation message (I/NAV) broadcast on the E1-B signal. This digital signature allows receivers equipped with OSNMA to verify that the signal truly originates from Galileo and has not been tampered with or spoofed.

OSNMA is integrated into the Galileo Open Service signal, which is already used by most GNSS devices. This means no change to existing Galileo signal structure or navigation performance, preserving full backward compatibility. Non-OSNMA receivers continue to function normally, while OSNMA-capable receivers decode and authenticate the digital signature.

The European GNSS Service Centre (GSC), located at the National Institute for Aerospace Technology (INTA) in Torrejón de Ardoz, Spain, manages the generation and transmission of authentication messages to Galileo’s ground segment. The OSNMA service was developed in collaboration with industrial partners, including GMV and INDRA, who also contributed to Galileo’s High Accuracy Service (HAS), operational since January 2023.