this post was submitted on 24 Jul 2023
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Privacy
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Signal goes very far to protect even the tiniest bits of metadata.
For example see sealed sender, private contact discovery and group v2.
On the other hand, matrix stores your profile info, group membership, and ongoing conversation metadata in plaintext, some of them replicated across homeservers. In addition to metadata that matrix doesn't encrypt, they also do not encrypt some actual data like emoji reactions.
Edit: clarified that conversations are not in plaintext. My wording what confusing as hell sorry.
Matrix doesn't store your ongoing conversation in plaintext. It's encrypted by default.
What I meant by that is not the actual message content, but who you're talking to and when is stored on the home server.