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Cake day: February 10th, 2024

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  • mox@lemmy.sdf.orgtoPrivacy@lemmy.mlDoes MATRIX recipients know my IP?
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    9 days ago

    Obviously you need someone joining the room for the room metadata to be shared between homeservers.

    Well then, your assertion that Matrix gives it freely is false.

    Not so with Matrix, where a joining homeserver get full retroactive access to all the room metadata since the room’s creation.

    This is false, too. Historical event visibility is controlled by a room setting. (And if you don’t trust admins of a sensitive room to configure for privacy, then you’re going to have bigger problems, no matter what platform it’s on.)

    Edit: I suppose you might argue that you can bypass this by running your own homeserver and attempting to join the room from it, thereby granting visibility not through joining (as you wrote), but instead through federation with the server you control. The thing is, you can’t do it without permission. Room admins can simply deny your join request when they see what server you’re on. This might make sense in a particularly sensitive room, for example, just as it would to restrict history visibility.

    you really need to stop privacy LARPing

    LARPing? I’m not the one stirring up drama with falsehoods and patronizing snark, am I? Farewell.


  • Matrix stores all this info and gives it freely to other servers retroactively(!)

    Can you show me the part of the spec that allows a server with no room members to get private room info from another server? I’m skeptical, but if true, I believe that would be worth reporting as a bug.

    network layer sniffing (which is anyway much harder to do)

    You’re funny.


  • The network layer of all internet servers reveals almost everything you listed. Signal has the same problem, and there’s nothing they can do about that. The only way to avoid it is to use a completely peer-to-peer model (Matrix has started work on this, btw) and avoid communicating across network routes that can be monitored.

    There might be one exception, depending on what you mean by “Accounts”: The user IDs participating in a room can be seen by server operators and room members. But then again, server operators can already see their users’ IP addresses (which is arguably more sensitive than a user ID), and I believe room members have to be allowed into the room in order to see them. For most of us, that’s fine. Far from a disaster.


  • Human behavior is funny, isn’t it? No matter what the topic, there are always people around who like to repeat criticism they heard from someone else, even if it’s so vague as to be useless (“metadata disaster”) or they don’t understand the details at all.

    It’s not a disaster. A few minor bits of metadata (avatars and reactions, IIRC) haven’t been moved into the encrypted part of the protocol yet. If that’s a problem for your use case, then you might want to choose a platform with different flaws, or simply avoid those features. It’s already good enough for the needs of many privacy-minded folks, though, and it continues to get better.