Feature: Private Contact Discovery (discovery without servers learning your contacts list) #7649
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ajvsol
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We rebuilt our contact discovery process as part of the work outlined in https://matrix.org/blog/2019/06/30/tightening-up-privacy-in-matrix/ - specifically matrix-org/matrix-spec-proposals#2134, which is in turn implemented by matrix-org/matrix-js-sdk#1021 We have no plans to implement trustzone / SGX style private contact discovery, not least due to concerns over SGX's trust model. |
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Maybe this is the solution for decentralized IM Services to scale: Mobile Private Contact Discovery at Scale by Daniel Kales (TU Graz), Christian Rechberger (TU Graz), Thomas Schneider (TU Darmstadt), Matthias Senker (TU Darmstadt), and Christian Weinert (TU Darmstadt) in 28. USENIX Security Symposium (USENIX Security'19). Paper available on ePrint. POC: https://github.com/contact-discovery/mobile_psi_android I didn't have a deep read into it, but it seems aligned with the way matrix does things, seems future proof for web3 and still works on current web :) Please guide me should I bring up this idea in a different existing issue or create a new one! |
su-ex
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Feb 15, 2022
* Support a config option to change the default device name ([\element-hq#20790](element-hq#20790)). * Capitalize "Privacy" in UserMenu ([\element-hq#7738](matrix-org/matrix-react-sdk#7738)). Contributed by @aaronraimist. * Move new search experience to a Beta ([\#7718](matrix-org/matrix-react-sdk#7718)). Fixes element-hq/element-meta#139 element-hq#20618 and element-hq#20339. * Auto select "Other homeserver" when user press "Edit" in homeserver field ([\element-hq#7337](matrix-org/matrix-react-sdk#7337)). Fixes element-hq#20125. Contributed by @SimonBrandner. * Add unread badges and avatar decorations to spotlight search ([\element-hq#7696](matrix-org/matrix-react-sdk#7696)). Fixes element-hq#20821. * Enable location sharing ([\element-hq#7703](matrix-org/matrix-react-sdk#7703)). * Simplify Composer buttons ([\element-hq#7678](matrix-org/matrix-react-sdk#7678)). * Add a warning to the console to discourage attacks and encourage contributing ([\element-hq#7673](matrix-org/matrix-react-sdk#7673)). Fixes element-hq#2803. Contributed by @SimonBrandner. * Don't show replaced calls in the timeline ([\element-hq#7452](matrix-org/matrix-react-sdk#7452)). Contributed by @SimonBrandner. * Tweak `/addwidget` widget names ([\element-hq#7681](matrix-org/matrix-react-sdk#7681)). * Chat export parameter customisation ([\element-hq#7647](matrix-org/matrix-react-sdk#7647)). * Put call on hold when transfer dialog is opened ([\element-hq#7669](matrix-org/matrix-react-sdk#7669)). * Share e2ee keys when using /invite SlashCommand ([\element-hq#7655](matrix-org/matrix-react-sdk#7655)). Fixes element-hq#20778 and element-hq#16982. * Tweak spotlight roving behaviour to reset when changing query ([\#7656](matrix-org/matrix-react-sdk#7656)). Fixes element-hq#20537 element-hq#20612 and element-hq#20184. * Look up tile server info in homeserver's .well-known area ([\element-hq#7623](matrix-org/matrix-react-sdk#7623)). * Add grouper for hidden events ([\element-hq#7649](matrix-org/matrix-react-sdk#7649)). * The keyboard shortcut is control (or cmd) shift h. ([\element-hq#7584](matrix-org/matrix-react-sdk#7584)). Contributed by @UwUnyaa. * [Release] Fix cutout misalignment on some decorated room avatars ([\element-hq#7785](matrix-org/matrix-react-sdk#7785)). * [Release] Fix add existing space not showing any spaces ([\element-hq#7756](matrix-org/matrix-react-sdk#7756)). * [Release] Inhibit Room List keyboard pass-thru when the search beta is enabled ([\element-hq#7754](matrix-org/matrix-react-sdk#7754)). * [Release] Fix space member list not opening ([\element-hq#7755](matrix-org/matrix-react-sdk#7755)). * Null-guard ELS from null summaryMembers ([\element-hq#7744](matrix-org/matrix-react-sdk#7744)). Fixes element-hq#20807. * Improve responsiveness of the layout switcher ([\element-hq#7736](matrix-org/matrix-react-sdk#7736)). * Tweak timeline card layout ([\element-hq#7743](matrix-org/matrix-react-sdk#7743)). Fixes element-hq#20846. * Ensure location bodies have a width in bubbles ([\element-hq#7742](matrix-org/matrix-react-sdk#7742)). Fixes element-hq#20916. * Tune aria-live regions around clocks/timers ([\element-hq#7735](matrix-org/matrix-react-sdk#7735)). Fixes element-hq#20967. * Fix instances of decorated room avatar wrongly having their own tabIndex ([\element-hq#7730](matrix-org/matrix-react-sdk#7730)). * Remove weird padding on stickers ([\element-hq#6271](matrix-org/matrix-react-sdk#6271)). Fixes element-hq#17787. Contributed by @SimonBrandner. * Fix width issue of the composer overflow menu items ([\element-hq#7731](matrix-org/matrix-react-sdk#7731)). Fixes element-hq#20898. * Properly handle persistent widgets when room is left ([\element-hq#7724](matrix-org/matrix-react-sdk#7724)). Fixes element-hq#20901. * Null guard space hierarchy ([\element-hq#7729](matrix-org/matrix-react-sdk#7729)). Fixes matrix-org/element-web-rageshakes#10433. * Fix add existing rooms button ([\element-hq#7728](matrix-org/matrix-react-sdk#7728)). Fixes element-hq#20924. Contributed by @SimonBrandner. * Truncate long server names on login/register screen ([\element-hq#7702](matrix-org/matrix-react-sdk#7702)). Fixes element-hq#18452. * Update PollCreateDialog-test to snapshot the html and not react tree ([\element-hq#7712](matrix-org/matrix-react-sdk#7712)). * Fix creating polls outside of threads ([\element-hq#7711](matrix-org/matrix-react-sdk#7711)). Fixes element-hq#20882. * Open native room when clicking notification from a virtual room ([\element-hq#7709](matrix-org/matrix-react-sdk#7709)). * Fix relative link handling in Element Desktop ([\element-hq#7708](matrix-org/matrix-react-sdk#7708)). Fixes element-hq#20783. * Reuse CopyableText component in all places it can be ([\element-hq#7701](matrix-org/matrix-react-sdk#7701)). Fixes element-hq#20855. * Fit location into the width of the container ([\element-hq#7705](matrix-org/matrix-react-sdk#7705)). Fixes element-hq#20861. * Make Spotlight Dialog roving reset more stable ([\element-hq#7698](matrix-org/matrix-react-sdk#7698)). Fixes element-hq#20826. * Fix incorrect sizing of DecoratedRoomAvatar in RoomHeader ([\element-hq#7697](matrix-org/matrix-react-sdk#7697)). Fixes element-hq#20090. * Use a more correct test for emoji ([\element-hq#7685](matrix-org/matrix-react-sdk#7685)). Fixes element-hq#20824. Contributed by @robintown. * Fix vertical spacing in `compact` `<ContextMenu>` ([\element-hq#7684](matrix-org/matrix-react-sdk#7684)). Fixes element-hq#20801. * Fix the sticker picker ([\element-hq#7692](matrix-org/matrix-react-sdk#7692)). Fixes element-hq#20797. * Fix publishing address wrongly demanding the alias be available ([\element-hq#7690](matrix-org/matrix-react-sdk#7690)). Fixes element-hq#12013 and element-hq#20833. * Prevent MemberAvatar soft-crashing when rendered with null member prop ([\element-hq#7691](matrix-org/matrix-react-sdk#7691)). Fixes element-hq#20714. * Ensure UserInfo can be rendered without a room ([\element-hq#7687](matrix-org/matrix-react-sdk#7687)). Fixes element-hq#20830. * Make polls fill column width in bubbles layout ([\#7661](matrix-org/matrix-react-sdk#7661)). Fixes element-hq#20712. * Add a background to expanded nick name in IRC layout to make it readable. ([\element-hq#7652](matrix-org/matrix-react-sdk#7652)). Fixes element-hq#20757. Contributed by @UwUnyaa. * Fix accessibility and consistency of MessageComposerButtons ([\element-hq#7679](matrix-org/matrix-react-sdk#7679)). Fixes element-hq#20814. * Don't show shield next to deleted messages ([\element-hq#7671](matrix-org/matrix-react-sdk#7671)). Fixes element-hq#20475. Contributed by @SimonBrandner. * Fix font size of spaces between big emoji ([\element-hq#7675](matrix-org/matrix-react-sdk#7675)). Contributed by @robintown. * Fix shift-enter repeating last character ([\element-hq#7665](matrix-org/matrix-react-sdk#7665)). Fixes element-hq#17215. Contributed by @SimonBrandner. * Remove Unpin option from maximised widget context menu ([\element-hq#7657](matrix-org/matrix-react-sdk#7657)). * Fix new call event grouper implementation for encrypted rooms ([\element-hq#7654](matrix-org/matrix-react-sdk#7654)). * Fix issue with tile error boundaries collapsing in bubbles layout ([\element-hq#7653](matrix-org/matrix-react-sdk#7653)). * Fix emojis getting cropped in irc & bubble layouts by anti-zalgo ([\element-hq#7637](matrix-org/matrix-react-sdk#7637)). Fixes element-hq#20744. * Fix space panel edge gradient not applying on load ([\element-hq#7644](matrix-org/matrix-react-sdk#7644)). Fixes element-hq#20756. * Fix search results view for layouts other than Group/Modern ([\element-hq#7648](matrix-org/matrix-react-sdk#7648)). Fixes element-hq#20745.
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Private Contact Discovery is a feature implemented by Signal which allows you to discover your social graph without revealing your contacts to any server. This is one of the bigger metadata leaks and helps prevent that privacy issue where your contact info is up for grabs to any server which any of your contacts use.
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