The strongest way is simply to not display it unless the user has been validated.
If you have manually entered this info, or have access to make your sensitive info to use a custom-page template or with a shortcode, you can program your code to only selectively display after the user has been authenticated.
For example (the shortcode method):
function my_data_func( $atts ){
if(is_user_logged_in() && current_user_can('manage_options')) {
//display my server data via return statement.
} else {
return 'I am sorry. You must be logged in as an administrator to view this content.';
}
}
add_shortcode( 'my_data', 'my_data_func' ); //Ex. [my_data]
The page template method works in a similar way, but uses an extra file in the theme that you then specify your protected page to use.