Static variables aren't *particularly* more or less vulnerable than a non-static variable. If you're think your variables are vulnerable, encrypt them! One way is saving your variables in an XML file and [encrypting the XML text](http://unitynoobs.blogspot.com/2012/01/xml-encrypting.html).
If you want to access your variables from other classes differently, you could try instantiating the child classes. This isn't really more or less secure though.
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