The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning. Learn more →
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ContactDiscoveryService reviews and mentions
- Is it generally ok to store phone numbers in a firestore database?
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7 Best Open-Source Alternatives To WhatsApp In 2023
[1] https://signal.org/blog/private-contact-discovery/
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WhatsApp data leak: 500M user records for sale
Signal uses SGX for remote attestation, which presumably lets the client verify that the code running on the server is a build of the OSS code and not a modified version. But I don't know the details or if this is reliable.
SGX and remote attestation described here:
https://signal.org/blog/private-contact-discovery/
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WhatsApp data breach sees nearly 500 million user records up for sale
Signal does private contact discovery and the effort they've gone to to do this is quite impressive.
- A brief family story about convincing boomer parents to Signal
- Elon on Signal
- Absolutely Insane "Feature"
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Types of Execution Environments, Attestation and SGX
TEEs have numerous privacy-enhancing applications that may benefit users. One of them is, as discussed earlier, private contact discovery; the Signal application uses a contact discovery service enhanced using Intel SGX, a TEE technology, to protect its users' privacy. A similar application of TEEs is performing malware analysis in a remote cloud service, so that the service may not identify users by the contents of their devices, such as the applications they have installed, especially important as 98.93% of users may be uniquely identified by the list of applications they have installed.
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Twilio Incident: What Signal Users Need to Know
Signal (or, more accurately, one of its predecessors) used to use client-side private set intersection for contact discovery, but this scales poorly [1].
Now they use a solution based on Intel SGX and server-side trusted computing [2].
[1] https://signal.org/blog/contact-discovery/
[2] https://signal.org/blog/private-contact-discovery/
- Where are Signal servers located and how is it safer than Swiss-based Threema ?
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A note from our sponsor - WorkOS
workos.com | 26 Apr 2024
Stats
signalapp/ContactDiscoveryService is an open source project licensed under GNU Affero General Public License v3.0 which is an OSI approved license.
The primary programming language of ContactDiscoveryService is C.
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