Create a WPA hotspot

Question

I would like to share my wired connexion by Wifi.

As you may know, Mac OS Internet Sharing option doesn't support more than WEP security protocol. In other words, it's creating a nearly opened network.

Is there any software able to create a more secured Wifi hotspot (at least WPA) compatible with Mac OS ? Something like Connectify or Virtual Router under Windows 7.

I have a MacBook Pro (15-inch, Early 2011).