File:private-message-brainstorming-token.png

title: Private Messaging
participant alice
participant bob
participant pm.bob
participant pm.alice

alice->bob: 1. hey I want a token to send you things.\nwhere can I get it from?
bob-->alice: you can get it from pm.bob
alice->pm.bob: 2. I am alice and I want a token to send\nthings to bob, my auth code is xxxxxxxx
pm.bob-->alice: How can I verify you are actually alice?
alice-->pm.bob: you can talk to token.alice
pm.bob->pm.alice: 3. Hey there, I heard alice wants to\nget a token for bob, and sent me the\nauth code xxxxxxxx. Is this true?
pm.alice-->pm.bob: yes!
pm.bob->pm.alice: 4. Okay, here is a token\nfor auth code xxxxxxxx: zzzzzzzz
pm.alice->bob: 5. hey bob, where can I send messages to you?
bob-->pm.alice: send them to pm.bob!
pm.alice->pm.bob: 6. Here is a message: hello bob\nwith token zzzzzzzz!