[Standards] XEP-0308: Last Message Correction and Carbons

Kevin Smith kevin.smith at isode.com
Fri Sep 30 08:49:07 UTC 2016


> On 29 Sep 2016, at 22:58, Dave Cridland <dave at cridland.net> wrote:
> 
> 
> On 29 Sep 2016 22:00, "Kevin Smith" <kevin.smith at isode.com> wrote:
> >
> > On 29 Sep 2016, at 21:17, Dave Cridland <dave at cridland.net> wrote:
> > > (And please, folks, unless you can think of something I can't, a
> > > randomish string prefix and a counter is fine).
> >
> > The dangers of using counters in stanza IDs and leaking information :)
> 
> Yes, quite. I meant to argue against generating UUIDs and otherwise using a lot of entropy, and got carried away - but a random key and hmaccing a counter should be okay.
> 
> Point being, if the stanza id attribute is causing us a problem, that can be fixed in compatible ways.

Possibly true, yes. It doesn’t resolve the MUC issue, but maybe it does everything else. We should probably explicitly call out in carbons and MAM the importance of preserving the id in the header.

/K



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