Anthony Ferrara has posted his second video tutorial to his site today introducing encryption for those not familiar with it. (The first video is here, "Paradigm Soup")

Encryption can be a complex beast of mathematical operations. In this video, we explore the evolution of modern cryptography and some of the basic underlying principles that it uses to keep data secure.

You can watch it in-page or head over to YouTube for the larger version. You can also follow his playlist to keep up with his future videos.