Back in March 2013 a massive brute force attack brought me to enforce my customer WordPress installs, I found a great tool in this plugin, which guards those topic entry points for the casual and probably even strong intrusion effort (depending on install settings and hosting server safety).
I found particularly nice to receive notifications about file changes, deletions, etc.
After all I am using it as well even in my own SEO website.
Thanks for offering this to our WP Community! This one lives in my "basic install" pack.