[Plugin: BulletProof Security] Looking for Perfection of Security

Is it enough to just use one plugin is very powerful for the security of wordpress blog?

Nope.

I mean, probably not; security is about best practices and no plugin can really solve that one for you.

What other types of plugins that can complement the perfection of security?

That one looks quite feature laden but I suggest you get your backup and restore strategy in place.

https://codex.www.ads-software.com/WordPress_Backups
https://codex.www.ads-software.com/Backing_Up_Your_Database
https://codex.www.ads-software.com/Restoring_Your_Database_From_Backup

If the Bad Thing™ happens to your WordPress installation, being able to role back the files and database to an earlier (hopefully clean) version is a life saver.

What do you mean by security?

I’ve been running my WP blog since 2004.
I have never has any security problem.
Why?

I use a good web host.
I keep my plugins up to date.
I keep my themes up to date.
I have a good password for my blog.
I have a good password for my ftp access.
I NEVER install plugins from anywhere but the official directory.

That’s pretty much all you need to do and a database backup as mentioned above it just as much about if the web host has a server crash as it is security.

https://vaultpress.com is one solution.

Yes it costs but let’s say next Friday you wake up to find your database has been deleted, or someone gained access and deleted all your posts.. You’d be very very happy to have paid for that piece of mind then. It’s insurance – look at it that way and then decide how much your blog is worth to you and how many hours it would take to put it all back yourself. Do you really want to trawl Google’s cache and accept that you’ve lost all the comments?