And as context, Professor Dan Boneh teaches the main introductory crypto class at Stanford (CS255) - it's a great intro for someone with some good CS fundamentals. The course syllabus is here:

http://crypto.stanford.edu/~dabo/cs255/syllabus.html

(Disclosure, I took the class a few years ago)

This is a great course. I also took it a few years ago and have been waiting for his Crypto 2 course since then. It seems like it's always "Coming Soon Fall 201x" though.