Application.Current.Properties what security/protection does it have?

Now that we can save the Xamarin.Forms.Application.Current.Properties to disk when we want I'm considering using it again.

Question: what protection if any does it have?

Is it a plain text file any app can read? So useful for storing app state information
Or is it a plain text file that only apps with root can read? So useful for storing some private information in
Or is it an encrypted high secure file? So useful for storing credit card details in?

Thanks