Conclusion and Open Problems


Proxy-based systems co-mingle trust and discovery.

Separation into untrusted messengers and a few trusted portals provides the best of both worlds.

Discovering forwarders: a few is easy; all is hard.

Open Problems
Better ways to slow the censor?
Hopping should more closely mimic the habits of a normal user.
Impersonating multiple clients should be more difficult.
Timing, etc.