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A key aspect to be considered in the design of new generations of global navigation satellite system (GNSS) signals and receivers is a proper partition between system and receiver contribution to the robustness against spoofing attacks. This article maps the current threats and vulnerabilities of GNSS receivers and presents a survey of recent defenses, focusing on cryptographic solutions suitable...
Galileo is studying the addition of Navigation Message Authentication (NMA) to its Open Service. NMA cryptographic data is mostly unpredictable, and this unpredictability can provide certain protection against replay attacks, depending on the user environment and how the signal is processed in the receiver. This paper first characterises Galileo NMA symbol unpredictability, which depends on how the...
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