I was recently reading up on Len Sassaman and his fascinating work on anonymous remailers. This used to be a very active area of research for cypherpunks, but it seems like people don't talk as much about these ideas anymore. I suppose TOR is the successor to these efforts (despite the fact that it seems controlled by the NSA).

In any case, while reading about Len, I came across this spectacularly good talk on YouTube. I learned so many cool things from the talk about how to design secure decentralized systems and how to evaluate threat models and think of creative attacks (as well as how to defend against them) that I wanted to share it with more people, thus the transcript linked here.

Even though the talk is "old" (from 2003), it still seems incredibly relevant and interesting to me, and I think you will enjoy it, too.