Like the subject says.<p>Background: I have an opportunity to do some post-grad research in the near future and am having trouble finding something still unexplored.<p>I'd originally wanted to look at encrypted protocols which end up revealing (through metadata, etc.) what's really happening. However, I see a lot of work has already been done in that arena.<p>So, I'm turning to the collective wisdom of HN for ideas on where to focus my efforts. I'd prefer something IA- & network- related, but would gladly consider anything.<p>Thanks!