Simple and easy WordPress plugin for protecting your login form.
Plugin implements setting the security key for the login form.
Thereby significantly reducing the likelihood of automatic brute force.
The security key is transmitted manually as GET parameter for login form.
For example: http://example.com/wp-login.php?sk=my_secure_key
Warning: Be careful if sk parameter is not specified, the login will not be possible, even if specifying the correct username and password.