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Interoperable Private Identity Discovery for E2EE Messaging

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Giles Hogben , Femi Olumofin
Last updated 2024-05-08 (Latest revision 2023-11-05)
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document specifies how users can privately discover each other's Service Specific Identifiers (SSIs) when using end-to-end encrypted messaging services across multiple providers. Users can retrieve SSIs without revealing their social graphs to service providers they are not delivering messages through, using their phone numbers, email, user IDs, or other Service Independent Identifiers (SIIs). Our specification can be based on private information retrieval or associative private sets membership schemes, both of which provide reasonable tradeoffs between privacy and cost.


Giles Hogben
Femi Olumofin

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)