Javcek You don't have too, however it is recommended to use a VPN plus Tor if you're able.
Better than Signal?
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.
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