Re: Proposed XMPP Extension: End-to-End Encrypted Contacts Metadata

On Fri, Jan 16, 2026 at 1:10 PM Daniel Gultsch <[email protected]> wrote:
>
> On Fri, Jan 16, 2026 at 9:41 AM Goffi <[email protected]> wrote:
>
> > That's exactly that; having all in one pubsub item means having the whole
> > roster each time there is an update. Legacy bookmark was doing that, and
> > experience showed that it caused troubles.
>
> I’m expecting significantly fewer writes to the roster than on
> bookmarks because we are not - for example - flipping autjoin flags.
>
> To me the encryption here is the overhead. Especially OpenPGP has a
> certain overhead per item. On initial connect I would much rather
> decrypt one item and have the entire roster instead of n items.
>
> And having one item also adds a bit of obscurity since the server
> doesn’t see exactly how many users are in my roster, If i’m deleting
> or adding a roster item and so forth.

Oh. And you are also avoiding weird bugs where various items of the
roster are encrypted with different key material. I mean obviously
nobody would attempt to do that on purpose but key material can change
after device migration and stuff.

cheers
Daniel
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