Eric Mann

Rather than sending usernames and passwords in plain text with every request, we’re going to use a set of public/secret keys to hash data and authenticate instead.
On your WordPress profile, you will see a new “Remote Publishing Permissions” section listing out the applications that have permission to publish, along with their public and secret keys.
New applications can be added whenever you want. You can also change the names of applications, or revoke publishing permission by deleting them.
<h3>Additional Information</h3>
Lock graphic designed by Scott Lewis from the thenounproject.com

Secure XML-RPC

More secure wrapper for the WordPress XML-RPC interface.

toxnico

Did you ever feel like your website or blog login page is ridiculously fragile and reachable, and could be easily broken in by an intruder?
Personally I hate to think of hundreds of people playing with my door lock hundreds of times a day. It’s the same with my blog login page.
On WordPress, there are two main potential vectors of bruteforce intrusion: 
* http://my-site.com/wp-login.php, which is the login page 
* http://my-site.com/xmlrpc.php, which is an API gateway for interacting with third party applications.
This plugin adds one security layer in front of your login page, and by the way you can also disable XML-RPC with a simple checkbox if you don’t need it (XML-RPC is a WIDELY used vector of attacks).
The idea is simple: you choose a pair of words, and when you want to access your login page, you just have to provide them in the URL like this: http://my-site.com/wp-login.php?word1=word2. That’s all! 
If you try to access your login page without this pair of words, you get a configurable error message, where you can insult the attacker as much as you want 😉

WP Login Door

This plugin is the easiest way to hide your login page and thus avoid brute force attacks



Simple and useful

Adds a secret URL key to access the login page and lets you disable XML-RPC, protecting against bruteforce attacks.

Secure XML-RPC vs WP Login Door