Thanks! I'm actually an old-time geek and IETF person, and do some work on security, but would like to get some better grounding. I sometimes find that other security people in the IETF have what appear to me to be naive views on things like usability, and seem to be making the wrong tradeoffs because of that, but they are "better educated" than I am, so figuring out how to become more educated myself is a priority.