How to secure save game datas and to get a response for internet connexion?

I’m saving datas like highscore, life left with “Save game” and it works well.
But when i check it on my mobile, there is a folder “UE4Game” and i can edit the content of each savegame…
So i want to avoid it or it’s easy to modify highscore…
Any idea about this ?

Also i’m using Va rest plugin to check the current date and time and i’ll need to check the internet connexion, how can i do this with Blueprint ?
Thank you for your help !!!