Where do I learn about cryptography?
Coursera also has three cryptography classes: Cryptography I, Cryptography II, and Intro to Cryptography (all taught by Dan Boneh).
And, of course, Bruce Schneier's Cryptography Engineering (Applied Engineering is somewhat deprecated).
For the record, Cryptography Engineering is his latest book on the topic, and it is a good one. But like all technical books, it's also a little out of date.
0: http://www.amazon.com/Cryptography-Engineering-Principles-Pr...