- Open source
   - Generate a private key as part of the setup
   - Upload your public key to the public key servers
   - Access camera to read a key (qr code) from another device
   - Display QR code of your private key (so you can sync it
    to another device)
   - Display a QR code of your public key (so someone you meet in
    public can copy it and you can then trust that key)

^ Keybase [1] has a mobile app in the works that will theoretically be able to do all of this. I'll be curious to see how it comes along.

- [1] https://keybase.io/