If I accidentally leaked my Matrix recovery key (which I assume that’s what the long string of spaced out random letters is called?), is it possible to reset it such that the previous key can no longer be used to decrypt the messages?
Yes, it is possible to reset. You should however back up all of your keys manually first. To clarify, matrix has two security keys. The keys that actually encrypt messages, and the security key that verifies that it is okay for the server to send decryption keys to your device. It sounds like you leaked the second one. Replacing it is fine so long as you already have your message keys backed up
Thank you! Do you know of any resources on how to reset either key?
It’s under the security tab in element. The options are fairly self-explanatory.
Thank you!