Privacy protected localization and authentication of georeferenced measurements using Galileo PRS

This paper describes two methods how ordinary users can profit from privacy protected localization and geo-referenced measurements authentication using the Galileo public regulated service (PRS). The user does not need to care about any security related PRS-receiver issue and his localization privacy is inherently protected. A raw data snapshot, containing only Galileo PRS data, is combined with an artifact to be authenticated and forwarded to a PRS enabled agency server. All PRS and security related functions are implemented on this server located in a secured place. The server uses cross-correlation and snapshot positioning methods to authenticate or obtain a position information out of the raw data. The described methods will not provide any direct PRS information, like PRS position or time, to the ordinary user. Only the specific user request is responded. Having outlined the architecture of possible implementations, limits and applications of the idea are discussed. Possible attacks on the methods are described with mitigation measures. The paper concludes with a comparison to the state of the art and other publications and projects in this field of GNSS authentication.