Easy and wonderful explanation of public key cryptography (video)

Nice video to introduce you the basics of public key cryptography, using really good analogies:

The makers of it (artoftheproblem.net) have a collection of short videos explaining RSA encryption, more cryptography concepts, information theory and mathematics. Sadly, I don’t have time to see them now, but the site is going directly to my Bookmarks, hoping I can watch them in the future.