Challenging the Galileo Open Service Navigation Message Authentication in the Public Observation Phase
Matej Bažec, Franc Dimc, University of Ljubljana, Faculty of Maritime Studies and Transport, SLO

Galileo, the European Union-backed GNSS, recently began transmitting OS-NMA (Open Service Navigation Message Authentication) signals in its E1B I/NAV data message. The service is currently in the public observation phase and is expected to be operational in 2023. The raw Galileo binary data was acquired by an Ublox-M8N based device initially unaware of OS-NMA. The binary data was then analyzed in real-time on a personal computer. The key chain and message authentication were performed in software. The experimental setup was also tested for reliability at a lower signal-to-noise ratio compared to some consumer-grade jamming devices and in a degraded signal environment.