Essential plugin

I have to say that I’m not a big WordPress fan but sometimes I have to use it for some projects.
This plugin not only gives you the opportunity to “hide” all the “wp-” files and directories, but increases WordPress security.
It takes some time to get familiar with it but then it works fine.
The only downside is that (the free version) doesn’t support multisite, but I think it’s legitimate to ask for a fee for a useful job.