SILC Channel for the Paranoid?

[Martin Albrecht]

Hi there,

I'm one of the kopete_silc developers (the less active one :-) ). We were 
wondering if it was possible to create a channel using SILC which's messages 
can never be read by the server even if it is not to be trusted. We know that 
this is possible by specifying a channel key ("+k 'secretkey'") manually but 
we are interested in something without user interaction of this kind like 
using the public keys. I was under the impression that option "+C" performs 
this but I seem to be wrong about this, am I? 

To clarify, here's my use-case: A,B,C need to talk privately and have their 
public keys exchanged and trusted. A creates "ad-hoc-channel" with psiC 
(private, secret, invitation only, public key) and invites B and C using 
their public keys. If the server was hacked could an attack read messages on 
the channel? If these messages are not secure against the server is there any 
way to make them secure against the server when all parties sit behind NAT?

Regards & thanks for making SILC possible,
Martin