4 ms·
We might have computers, but GPS signals can be spoofed: https://en.wikipedia.org/wiki/Spoofing_attack#GPS_Spoofing https://en.wikipedia.org/wiki/Spoofing_atta
by gavazzy 11y ago
We might have computers, but GPS signals can be spoofed:
https://en.wikipedia.org/wiki/Spoofing_attack#GPS_Spoofing https://en.wikipedia.org/wiki/Spoofing_attack#GPS_Spoofing
- gruez 11y agoIs there a reason why the signals aren't digitally signed? I understand that GPS and GLONASS was deployed over 30 years ago, but surely Galileo, with its first satellite launched 4 years ago can have this?
- Nrsolis 11y agoSpoofing of GPS signals isn't generally the problem the US military is most concerned about. It's availability. The assumption is that in any significant event, US space assets will be unavailable either momentarily or for some extended period. Chinese Anti-SAT weapons are one indicator that this is a likely avenue of attack for any weaker actor seeking to degrade our capabilities. So, celestial navigation is a crude but workable substitute for GPS but it has the distinct advantage of being ancient and nearly impossible to impede unless you can change the weather or the positions of the heavenly objects.
- kevinchen 11y agoHere's a paper that proposes GPS authentication based on signing and statistics about the signals (lots of math): http://radionavlab.ae.utexas.edu/images/stories/files/papers/nma.pdf http://radionavlab.ae.utexas.edu/images/stories/files/papers... Paper from Los Alamos with a receiver-only implementation that would use: - abnormally high signal strength - abnormally regular transmissions - a secondary time source to double-check time (e.g. NTP on a smartphone) - dead-reckoning based on accelerometers/gyroscopes/compass to double-check position http://lewisperdue.com/DieByWire/GPS-Vulnerability-LosAlamos.pdf http://lewisperdue.com/DieByWire/GPS-Vulnerability-LosAlamos...
- maaku 11y agoGPS signals are weak. You simply jam them.