> On 7. Jul 2017, at 13:20, Ivan Vučica <[email protected]> wrote:
>
> Has there been any discussions on how would, hypothetically, XSF standardize
> lookup of contacts based on phone numbers?
>
> Context would be a hypothetical "modern-style" mobile IM client that bases
> everything around phone numbers.
>
> I have some vague thoughts about it, and no real ideas how to solve messaging
> and presence federation without centralizing contact lookup, but I am curious
> to hear whether I missed any standardization work.
There hasn’t been any standardisation work yet. It’s a tricky problem to solve
in a federated system, especially if you aim for high privacy and security
standards.
You probably want some phone number verification before entering entries in the
lookup database. Then you also want to hash + salt the entries and the request
so that the lookup server doesn’t gain your roster, etc. etc.
Cheers,
Tobi
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