Hey there,
In iOS I use ASIHTTPRequest which makes it pretty easy to make HTTP
Digest, Basic and NTLM requests:
http://allseeing-i.com/ASIHTTPRequest/How-to-use#handling_http_authentication
In the event where you really want to change the authentication
mechanism, you can override it and write a custom module for this :-)
Hope this helps!
--
David Coallier