ContactDiscoveryService VS jami-cli

[1] https://signal.org/blog/private-contact-discovery/

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/

Signal does private contact discovery and the effort they've gone to to do this is quite impressive.

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.

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/

I am surprised to not see Jami ( http://jami.net ) mentioned here yet. It is a GNU project and is fully cross platform. I use it to send files and messages between my devices, as easy as Telegram or Whatsapp.

I've used Jami (https://jami.net/) since a few years and it's been my first messenger I have ever installed on any device and any OS.

Jami (version 20230424-01): Audio & Video Calls / Chat Take Control of your Communication!

The other option is https://jami.net/. It seems to have a phone option and could potentially replace your current system.

Try Jami https://jami.net/! I'm kind of blown away by how well it works! I originally tried it about a year ago, but it was kind of a pain. My issues with it were fixed when they incorporated UnifiedPush. However, since iPhone will never have something like UnifiedPush, I wouldn't recommend it for iPhone users or people with many iPhone-using friends to convert.

Jami (version 20230227-01): Secure and distributed communication platform

jami.net and tox.chat sort of being the way skype originally was.