June 21, 2021


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Technology preview: Private contact discovery for Signal

At Signal, we’ve been thinking about the difficulty of private contact discovery
for a long time. We’ve been working on strategies to improve our current design, and
today we’ve published a new private contact discovery service.

Using this service, Signal clients will be able to efficiently and scalably determine
whether the contacts in their address book are Signal users without revealing the contacts
in their address book to the Signal service