[Standards-JIG] proto-JEP: Smart Presence Distribution

Michal vorner Vaner michal.vaner at kdemail.net
Thu May 18 08:42:04 UTC 2006

On Thu, May 18, 2006 at 04:38:33PM +1000, Trejkaz wrote:
> Hash: SHA1
> On 18/05/2006, at 16:29 PM, Philipp Hancke wrote:
> >That you are disclosing the privacy list to the remote server each  
> >time
> >you are doing a presence broadcast.
> >The assumption that your privacy list is something secret is not  
> >valid.
> Actually, you're only disclosing the fragment of the privacy list  
> which is relevant to the other server, and that happens no matter what.

And thats exatly the part they may be interested in.

> Case A: server sends the relevant information to the contact server,  
> in order to do simpler multicast presence.  The contact's server now  
> guesses the privacy list based on who they see missing from the  
> multicast group.
> Case B: server sends individual presence stanzas to each contact on  
> the remote server.  The contact's server now guesses the privacy list  
> based on who they see not receiving presence packets.
> The amount of information disclosed is the same, so why not at least  
> reduce the traffic?
No, its not. You have to guess. You could bombard the others by direct
presence and not have the other in privacy list.


Work with computer has 2 phases. First, computer waits for the user to tell it what 
to do, then the user waits for the computer to do it. Therefore, computer work 
consists mostly of waiting.

Michal "vorner" Vaner
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