15. Anonymity basics: secure communication

For secure communication I would only recommend SimpleX chat.

SimpleX uses quantum encryption. It uses TOR to relay messages - one path for you to receive, and another path for you to send. It is p2p so there are no timeouts, no file limits, no nothing. There is also no fingerprinting (as far as I know). There is only your autodeclaration name that you pick and can change at any time. You can have different names for different conversations. Once a conversation gets established - keys are swapped and you two (or more of you) auto-encrypt and auto-decrypt messages. So no fear of a man-in-the-middle-attack capturing anything.

It supports private chats and group chats.

It is entirely open source. Retoswap/haveno use it for anonymous conversations and they do unregulated anonymous coin exchanges in insane quantities.

You can install a GUI app, you can also install a tiny CLI version. It is quite fun and basic, but making it basic also makes it secure.

For privacy it is much better than Session, and infinitely better than Signal. Anyone loving private chat needs to learn about it!

It is like torrenting but for chats with extreme anonymity and encryption! It is TOR chatrooms/file sharing done right!

More information and download options here: https://simplex.chat/
You can install it through CLI too.

Other communication methods can be Matrix if configured right (so SimpleX should be your first choice) and there are XMPP servers but they are centralized around servers and most are on the clearnet. Therefore Simplex should be the default for privacy and anonymity lovers!