🛰️ Galileo #OSNMA uses Timed Efficient Stream Loss-tolerant Authentication (TESLA) chains for authentication which is a very elegant solution to work around the limited size available in GNSS packets. A signature, even less so a post-quantum one, would certainly not fit, so they are constructed on symmetric cryptography.
But TESLA chains do need to be renewed at some cadence. It's interesting to see how that's done operationally in a real world system.
https://destevez.net/2025/07/galileo-osnma-chain-renewal/
The EGNSS MATE project, led by Swiss Federal Railways, is experimenting with map-assisted sensor fusion algorithms to include GNSS into the signaling scheme of the European Rail Traffic Management System.
Nice to see Navigation Message Authentication #OSNMA used for this:
> “IABG analyzed the use of new Galileo services OSNMA and HAS within the ERTMS, and tested the performance of the new algorithms against jamming and spoofing attacks, as simulated in the laboratory.”
https://insidegnss.com/esa-funded-project-enables-moving-block-operations-in-european-rail/
The EGNSS MATE project, led by Swiss Federal Railways (SBB), has developed and tested new map-assisted sensor fusion algorithms, using European GNSS (Galileo)
Below is a copy of the IS-AGT-100A signal specification for an L1C security overlay. This specification includes descriptions of both slow and fast channel authentication. The new TESLA variant (IS-IGT-101) is also included here. Also below are copies of some of my papers on this topic as well as
#DYK that #EUSpace and satellites are at the heart of the EU's maritime security strategy❓
To protect #GNSS technology from #spoofing, the EU is currently testing the #Galileo 🇪🇺🛰️ Open Service Navigation Message Authentication (#OSNMA) feature
🔗https://www.euspa.europa.eu/newsroom/news/tests-galileo-osnma-underway
🐦🔗: https://n.respublicae.eu/defis_eu/status/1689535964153065472
Galileo has started testing Open Service Navigation Message Authentication (OSNMA) in the signal-in-space, allowing the first-ever OSNMA-protected position fix to be successfully computed. Testing will continue over the next months, ahead of a so-called “public observation” phase. This is the first-ever transmission of authentication features in open GNSS signals of a global navigation system.
#DYK that the #EUSpace Programme is a key element of the EU's maritime security strategy❓💡
To protect #GNSS technology from #spoofing, the #Galileo Open Service Navigation Message Authentication #OSNMA service🛰️ is currently being tested
More at👇
http://www.gsc-europa.eu/galileo/services/galileo-open-service-navigation-message-authentication-osnma https://t.co/3UdFoXmtbb
🐦🔗: https://n.respublicae.eu/defis_eu/status/1675874360425316352
Frédéric Jacobs
GNSS research
🇪🇺 DG DEFIS #StrongerTogether