TZ Guard
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This is a simple plugin which will help you to security your WordPress site.
The administrator will be protected by a security code.
Furthermore you can define a blacklist IP to refuse connection from spam ip and block the BOT system to access your WordPress site.
Arbitrary section
Note: Please remember your security code. You may not able login to your WordPress if you forget it. The first key of Security Code has to an alphabet character. Ex: temp123
This plugin is available for download for your site.