Security through obscurity is the name of the game here. These functions do three different things. Remove the version string from the code. No point in telling folks what version we're running. Removes any error messages (Wrong Password, No Such User, etc.) from admin login screens When the admin posts a comment, a CSS class is added. This remo…

Remove version string, error messages for better WordPress Security

// Source http://wordpress.stackexchange.com/posts/28530/revisions
// Tested and worked on WordPress 4.1 Beta
//REMOVE VERSION STRING FROM HEADER
remove_action('wp_head', 'wp_generator');

//HIDE LOGIN ERROR MESSAGES (Wrong Password, No Such User etc.)
add_filter('login_errors',create_function('$a', "return null;"));

// Remove admin name in comments class
// Source: http://www.wprecipes.com/wordpress-hack-remove-admin-name-in-comments-class
function remove_comment_author_class( $classes ) {
    foreach( $classes as $key => $class ) {
        if(strstr($class, "comment-author-")) {
            unset( $classes[$key] );
        }
    }
    return $classes;
}
add_filter( 'comment_class' , 'remove_comment_author_class' );