Overview
Nowadays, it is common hackers trying to get access to your blog, so, it is very important you make some actions to prevent your blog from being hacked. A good way to turn the login system of your blog more secure is to use that plugin Captcha on Login. It will Protect your blog from login brute force attacks adding a captcha on login page. That plugin also locks IPS after a specific number of login tries failed, note that on the plugin's options page you can set these numbers.
Currently, the plugin also allow us to change the default admin username from admin to whatever you want. Changing the username of the admin is a great idea to prevent brute force atacks and turn your blog more secure.
Features
Limit the number of login attempts throught wp login form as well as auth cookies.
Option to change admin username and grown up the security
Report page, where you can see blocked ips and last 1000 sucess and failed logins.
Option to block IPs permanently
Option to unblock IPs
Option to define maximum number of login attempts befor locking the ip
Some visual options, as background image, color of text, number of characters, etc.
Sobre
The plugin Captcha on Login was created by Anderson Makiyama of Plugin WordPress
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