Since the server never hands out the same prekey twice (and the client would never accept the same prekey twice), we are able to provide forward secrecy in a fully asynchronous environment.
PFS only if you trust the server. Haven't we seen the "trust the server"-concept a few times too much lately?
Oh - and there are a few more issues with keeping our descendants in the loop. Information will be lost, no matter how careful you are....
Sincerely, the kids from the future.
- the swiss also have their intelligence services
- the swiss also have lawful interception
- you still need to encrypt everything as your data in transit to Switzerland might be intercepted elsewhere
Go dark. Now.
Regards from Switzerland