Is using an Matrix account from matrix.org private and secure enough to talk with my family members
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Is using an Matrix account from matrix.org private and secure enough to talk with my family members

So, I was told to not use Signal, so all that is left is Matrix. And I am not techy enough to have my own server and neither are my relatives, so Matrix.org is the only option

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How would the sender prevent messages from going to the admin user that joined the room?

It wouldn’t matter if a rogue admin eavesdropped on an E2EE room, because they would see encrypted blobs where the message content would be. That’s what E2EE is for.

https://en.wikipedia.org/wiki/End-to-end_encryption

How would the sender prevent messages from going to the admin user that joined the room?

You’re conflating multiple things. Merely joining a room does not grant access to message decryption keys.

I respect your curiosity, but I think you’re going to have to familiarize yourself with the software and concepts to get a detailed understanding of how all this stuff works. If you’re technically inclined, I suggest reading the protocol spec, or at least the parts that interest you. You could also drop in to the public chat room and ask more questions there: #matrix:matrix.org

I have read the spec, used the service and also implemented my own clients before, that is why I’m so confused by what you’re saying, because this has not been my experience at all. If a user joins a channel, whether they are an admin or not, whether it is encrypted or not, then unless the channel is explicitly setup to only allow verified users to talk (not the default), my understanding is there is nothing preventing that new user from seeing all new messages in the chat.

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