Sure, the original impetus for this was some discussion on the SimplySecure Slack of having a protocol which did not require any direct interactions between Alice and Bob for doing a private set intersection for contacts, mediated through a third party (the directory)
On Monday, February 29, 2016, Joseph Bonneau <[email protected]> wrote: > > > On Mon, Feb 29, 2016 at 12:38 PM, Tony Arcieri <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: > >> On Monday, February 29, 2016, Joseph Bonneau <[email protected] >> <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: >> >>> I'm not sure exactly what the goal is here. Is it for Alice and Bob to >>> find out which contacts they have in common without each revealing the >>> whole set? >>> >> >> Yes. Moxie did a great job of spelling out the problem and various >> non-solutions here: >> > >> https://whispersystems.org/blog/contact-discovery/ >> > > That post describe the problem of Alice and Bob trying to find out if > they're both using the same service. I asked if the goal is for Alice and > Bob to find out which contacts they have in common without each revealing > the whole set, which is a quite different proposition. It sounds from your > original message like you were asking about this, since you mentioned "Bob > is authorized in the directory to view Alice's contacts" > > -- Tony Arcieri
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