Reference variable encryption_key from config

[eluser]spheroid[/eluser]
I need to use the $config['encryption_key'] variable I've set in file application/config/config.php. I need to do this in a controller and a model each for registration and authentication for login.

How can I reference this variable without having to put this in each my controller and model:

Code:

$salt = "RANDOM STRING";

Thanks in advance!

[eluser]spheroid[/eluser]
Nevermind, answered here: http://ellislab.com/forums/viewthread/62303/