Does anyone know how would this platform support messaging between users? Since each user encrypts his own data, any broadcast would have to be encrypted with every destination's public key... doesn't seem to work for stuff like a message forum.
You should check out the message boards on Freenet, it does work (though Freenet is a bit heavy on the encryption and light on speed for some things...)
like in PGP, you would use a session key: symmetric encryption of the thread, then encrypt that symmetric key once for every thread- or forum member. you can only add people to this; to remove people from a thread you would need to send the remaining people a new session key. that's the rough idea we have, we are still waiting for someone to implement a research app so we can test how well this works.
