On 27 Feb 2013, at 13:53, Maxthon Chan <[email protected]> wrote:

> Well then can we envelope DO in something that is secure enough, like SSL or 
> SSH tunnel?

That would have no effect.  The problem is taking DO messages from an untrusted 
source, running them through a parser that was written for speed (not security) 
and then firing the resulting messages.  

> As what I know, Apple's Push Notifications are DO over SSL and iMessage works 
> on that.

No they aren't.  They are nothing like DO, they are similar to Distributed 
Notifications, which are not the same thing at all, and are only vaguely 
similar to that.

> If there is any way to do that using GNUstep and Étoilé, we can just make an 
> iMessage clone and enhance it with stuff like groups and friend permissions.

There is an example in my first Cocoa book using distributed notifications to 
implement a simple chat client, but I wouldn't recommend it for anything that 
has untrusted users (i.e. anything on the Internet).  

> Can GNUstep's NSSocketPort make use of SSL?

Yes.

David

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