title: Laravel restrict site by password
body: <p>I need to provide authentication my Laravel 5 site by password (no username, just only password). Access to site will possible only if user type correct password. 
  It can't be basic server authorization, because I have to implement some design.</p>
  
  <p>I know it is possible to do it with multiple authentication in Laravel, but I have no idea how to make it working with my standard (user and password) authentication in my application.</p>
  
  <p>Can someone help how to do it, please?</p>