Ioana Boureanu, Stephan Wesemeyer (Surrey Centre for Cyber Security, University of Surrey)

Global Navigation Satellite Systems (GNSS) are critical for infrastructure like energy, telecommunications, and transportation, making their accuracy vital. To enhance security especially against location spoofing, in 2024, the Galileo GNSS system adopted the Timed Efficient Stream Loss-Tolerant Authentication (TESLA) protocol, for Navigation Message Authentication (NMA). However, past and present TESLA versions have lacked formal verification due to challenges in modelling their streaming and timing mechanisms. Given the importance of formal verification in uncovering protocol flaws, this work addresses that gap by formally modelling and verifying the latest TESLA protocol used in Galileo; we verify Galileo’s TESLA protocol in the well-known Tamarin prover. We discuss our findings and, since this is work-in-progress, we contextualise them in terms of next steps for us, as well as for future Navigation Message Authentication protocols inside GNSS systems.

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Yan Pang (University of Virginia), Aiping Xiong (Penn State University), Yang Zhang (CISPA Helmholtz Center for Information Security), Tianhao Wang (University of Virginia)

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Zhongming Wang (Chongqing University), Tao Xiang (Chongqing University), Xiaoguo Li (Chongqing University), Biwen Chen (Chongqing University), Guomin Yang (Singapore Management University), Chuan Ma (Chongqing University), Robert H. Deng (Singapore Management University)

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