Synechist: Regarding your op announcement (So, there's a new OP...):

Under the section "XCHAT MESSAGE PROCESS", step 3), recommend the following change for clarity:

change from: ".....encrypts a packet containing his/her public key and sends to user B."

              to:  ".....encrypts a packet using user B's public key and sends to user B."

My first impression was that that step 3 implied it was (or could be interrupted as) user A's public key. It's only when you get to step 4 that it becomes clear that it's user B's public key being used to encrypt the packet.