Stressed student seeks professional help

No, not a psychiatrist (well maybe too hehe).
I have to finish my degree dissertation in the next few days and i need your help.
The topic is "security in online applications"
I have to mention common problems and solutions and have to write some example programs.
So far i have worked out SSL and wrote a simple SSL Server/Client.
SET is also something i found.
But i need more.
So i'd like to ask you people what would you mention in such an dissertation?

I'd be really thankfull if you people could help me

Just browsing through the forums should give enough information to write a book!