I run my own Matrix homeserver that I share with friends and family. Ever since I started working for Element back in February of 2020, I've learned a lot more about the Matrix protocol and what's possible to do with it. During a conversation with a few privacy minded friends that use my HS (HomeServer), I pointed out that the admin of a homeserver has a lot of power over their accounts and that they as users explicitly trust the admin. In this post, I want to explore and document the ways a malicious admin can mess with the privacy of a Matrix account. Note: malicious admin in this case can also mean a hacked admin.
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