How secure are asset bundles?

Hi, I thinking about securing asset bundles but need to know something more about them but I can't find info about it.

I'm going to release my game soon, but don't want for bundles to be so much open like they're now.
I mean for example manifest files, there is everything written in it and it can be viewed by everyone, there are texture names, models etc.

Also this bundles probably can be loaded by other unity application which, because all bundle names, paths etc. are written in manifest files.

I don't like it too much and there will be nice if exists easy way to encrypt this files to be at least little more secure.

I was looking how it looks in game Rust, but it looks like they using different system for bundles but they bundles are secure.