The upcoming Galileo OSNMA will provide authenticated navigation data  message against data-level spoofing attacks. By delivering data  authentication, the free-to-use Galileo OSNMA assures users that the  received Galileo navigation message comes from the system itself and has  not been modified by, for example, a spoofing attack.

Read the article from GPS World magazine:

https://www.gpsworld.com/rokubun-galileo-osnma-library-delivers-navigation-message-authentication/