Hi all, there is a free online course at:
by David Evans is a Professor of Computer Science at the University of Virginia where he teaches computer science and leads research in computer security.
You can go at your own pace and it is packed full of questions and exercises. Since we are about to cryptize the whole net, I think there will be great benefit in getting a deeper knowledge.
I’ll be studying this over the next few weeks doing a little bit each night, so if anyone wants to start a study let me know.