You can purchase security plugins . There are many security plugins out there that guarantees security for your own blog. One is known as rename your login url to secure your wordpress website Scan. The system is continuously scanned by this plugin . So that hackers can't penetrate the system, it also updates the safety.
Use strong passwords - Do your best to use a password, alpha-numeric, with upper and lower case and special characters. Easy to remember passwords are easy to guess!
Move your wp-config.php file up one Get the facts directory from the WordPress root. WordPress will search for it visit their website there if it cannot be found in the root directory. Also, nobody else will be able to read the document unless they've FTP or SSH access to your server.
You may extend the plugin features with premium plugins such as: Amazon S3 plugin, Members only plugin, DropShop etc.. So I think you can use it and this plugin is a good option.
Do your homework and our website some hunting, but if you're pressed for time and need to get this done once and for all, try out the WordPress security plugin that I use. It is a relief to know that my website (and business!) are secure.