First and foremost, I would direct this to your university's IT dept about the problem and make them aware that WP does not support EAP-TTLS yet so many users with WP's will not be able to connect to the Wifi at the university without the proper certificates. I know the our sister university has started to roll out instructions on how to get the certificates needed.
But anyway....I found another post here on WPC that talks about this, so I went ahead and copied what was mentioned there.
"the way I usually get CA certs is to go to an internal secure website at your work/university that uses the same CA. Once logged in you can click the padlock by the URL (talking IE here) and select view certificates. This tells you the Issued by and Valid from/to. Take note of the Certification Path and note that you'll effectively need this same path for your phone. I think typically self-signed will have just have two nodes (the parent and the current cert you are viewing), real certs will also have a root. The typical problem is that you don't have the CA. Before you do anything else, go back to the Details tab and do Copy to File.. This will bring up the export wizard. Export to one of the .cer extensions. (don't recall if both DER and Base-64 work - I think they do). Save this to your desktop or something. Go back to the Certification Path and double click on the parent and it will open the details of that cert, export this as well and save it. Then take the couple of .cer files and email them to yourself so you can install them from your phone. Don't forget to reboot your phone too."
It's not an easy task...but it should work.