[messaging] fyi: metadata-eliminating tor-based chat program: Ricochet

[Mike Hearn]

>
> That's true, the TextSecure server always knows who the sender and
> recipient are, regardless. Adding Tor to the sender side would only deny
> the server knowledge of the sender's IP address.
>
Right, but with the group signature scheme Pond uses, the server can also
be denied knowledge of which of a users contacts is sending the message.
This seems like a powerful privacy upgrade.

> The only thing preventing this from being more than a theoretical problem
> is the lack of mainstream adoption, and thus profit motive.
>
WhatsApp has the same design and no spam, as does regular SMS. It's pretty
simple to just ban users who spam, in the centralised context.
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