4 ms·
> Goward says Todd Humphreys of the University of Texas Radionavigation Laboratory suspects that China’s Beidou can mimic and spoof both GPS and Galileo signals
by beastcatdog 1y ago
> Goward says Todd Humphreys of the University of Texas Radionavigation Laboratory suspects that China’s Beidou can mimic and spoof both GPS and Galileo signals.
Galileo has optional cryptographic signatures of its navigational data. They embed the data into their broadcast. Can be used for free.
- SAI_Peregrinus 1y agoIt's still vulnerable to replay attacks, even with signed navigation data.
- causality0 1y agoWouldn't that require them to match the timestamp somehow?
- dghlsakjg 1y agoThe receiver derives the time from the signal itself.
- causality0 1y agoRight, so if the timecode in the signal doesn't match the receiving device's internal clock it should know the signal is invalid shouldn't it?
- dghlsakjg 1y agoThe time in the device isn’t independent of the received signal. The device typically has a clock that is much less accurate than the timesignal that gets set based on the gps signal. There aren’t many devices that can rival a gps satellite for time accuracy. A spoofed gps signal would not differ enough in time from a real one to tip you off. Further, a big part of the working of GPS is that your location is trilaterated from discrepancies in time from the various signals due to time of flight. The only way to accurately detect a spoofed signal is if you already know your location. (You can infer spoofing using IMUs, or signal analysis, etc… but that is a rare capability at this point)
- myself248 1y agoIf the receiver has no other even-slightly-plausible clock, then yeah, but let's assume that RTC chips and coin-cell batteries exist.
- quadhome 1y agoGalileo’s open service (civil-access) E1 signal incorporates public/private key encryption to digitally sign and authentify data. False Galileo signals from malicious forces are easily detected and rejected by GNSS receivers because they lack encryption watermarks. The feature, called Open Service-Navigation Message Authentication (OS-NMA), has been fully operational since August 2023.