The 3G Blacklist is a block of code put together by Jeff Starr that you drop into your .htaccess file to fight the majority of common security exploits. While not strictly a Wordpress-related .htaccess hack it’s a must have for anyone running on an Apache-based server (which would be most people reading this guide).
To find out how to make use of this brilliant resource visit the official site.
Here’s a quick summary from Jeff:
Work on the 3G Blacklist required several weeks of research, testing, and analysis. During the development process, five major improvements were discovered, documented, and implemented. Using pattern recognition, access immunization, and multiple layers of protection, the 3G Blacklist serves as an extremely effective security strategy for preventing a vast majority of common exploits.
The list consists of four distinct parts, providing multiple layers of protection while synergizing into a comprehensive defense mechanism. Further, as discussed in previous articles, the 3G Blacklist is designed to be as lightweight and flexible as possible, thereby facilitating periodic cultivation and maintenance.