If you are really dedicated to learn about cryptography, keep reading. Otherwise, just skip this post.
Jeff Goldberg mentioned in an earlier post (that I cannot locate right now) cryptography lecture. I believe it was Dan Boneh from Stanford University who has online free course called Cryptography 1.
I found it on https://coursera.org
It is free, just sign up, possibly download the app for iPad and follow along. Looks like a good course, I'll see how soon it gets over my head. So far I only listened to the history and basics of cryptography.