Stephen A. Weis, software engineer in the applied security group at Google, taught a few classes on cryptography this year for employees at Google. The classes were videotaped and are now available on YouTube. You can head over and view the following right now:
- Classical to Modern Cryptography
- Using Cryptography in Practice
- Security Definitions and Proofs of Security
- Verifying Elections with Cryptography.
You can also visit Weis' site where he lists numerous papers about encryption that you might also want to read