I wonder how much<p>> A small number of users performing "stealthy" authentication could
protect other users by creating uncertainty about which connections
can be undetectably attacked<p>is worth in our post-Snowden world. We already know that the governments of the US, China, Syria, etc, are carrying out pervasive surveillance. They could just start doing MITM attacks against _every_ connection, and we'd be in the same situation as we were before implementing opportunistic encryption?