CakePHP - Using User model in SecurityComponent

I'm creating a application based on REST requests and I'm using SecurityComponent for HTTP Authorisation. My question is - how can I use a User model with it? Instead of giving a array of usernames and passowrds...

Cheers, Lucas

1. Try to copy file app_controller.php to /app folder

2. Try to add the line

   var $uses = array('User');

after

class AppController extends Controller

line