Why do you want to hide your directory listing?
Allowing a Directory listing to be displayed discloses valuable or sensitive information about your site. Usually, hackers in their Reconnaissance stage try to gain valuable information about your site, and by allowing the viewing of the directory structure, you reveal to them intimate knowledge of your site, such as the plug-ins, themes & naming conventions used, and offer them a rough assessment of your security due diligence. While the mere knowledge of the sensitive or confidential files you have in your site may cause great loss to you on their own, this information in the hands of a hacker may be used to cause even greater harm your site.
