Zend Framework: different login for frontend and backend

Frontend and Backend are two modules and so I created a second Bootstrap.php in my modules/backend folder, which looks like this:

class Backend_Bootstrap extends Zend_Application_Module_Bootstrap
{
    public function _initAuth(){
        $auth = Zend_Auth::getInstance();
        $authStorage = new Zend_Auth_Storage_Session('Yourapp_Admin_Auth');
        $auth->setStorage($authStorage);
    }
}

This seems to be enough to make a backend login independent frmo the frontend, keeping frontend users from seeing my backend just because they’re logged in.

Thanks to the ZF community for NOTHING.