Icecube Yes, have been hosting my own XMPP server for more than 10 years now. XMPP is the way to go and would be a great choice if more people were willing to use it. Used OTR for many years then decided to go with OMEMO lately, it's a good option and has been tested by a lot of researchers.
Better than Signal?
I think I'll check out Matrix. Does it use google push for messaging or does it have its own implementation?
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Javcek Matrix is "an open network for secure, decentralized communication", not an app. Every Matrix-compatible app can use any notification system, including Firebase Cloud Messaging (FCM) by Google or Its own.
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Threema's developers downplayed 7 vulnurebilities found by the Swiss Federal Institute of Technology Zürich: https://www.kaspersky.co.in/blog/7-threema-vulnerabilities/25074/
GrapheneLover
The problem is that XMPP isn't really user friendly at all at a level where normies would ever consider using it. Conversations doesn't have a desktop app, for example.
Javcek Session is pretty decent but has some bugs. I use it occasionally but the biggest issue for any secure messaging platform is if I only have one or two contacts on it and everyone else I talk with can't be bothered to use it, there's little value. I use signal, session and even whatsapp, they have their own strengths and weaknesses but are all far superior to sms.
I like signal, it has a larger user base, a low barrier for entry and despite a lot of concern about having to provide a phone number, is quite secure.
GrapheneLover
Agreed, xmpp is great.
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Javcek Yep
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My family and I have been using Session for a year or so.
All in all, we prefer Signal, for fewer annoying things, but like the onion routing and the no phone number requirement of Session.