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this post was submitted on 11 Jul 2023
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Shamir's secret sharing, which was new to me, still means the password must be unencrypted though!? Otherwise there's no secret that can be shared. You can't get individual characters of non-reversible-hashed passwords.
Reading the Wikipedia page about Shamir's secret sharing I don't see anything about sharing part of the secret data, only that the decryption key is split-shared.
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So in this case the shared partial secret key would be a part of the secret. That seems like a bad idea, bad practice for security. But I see how it'd work.
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The most secure way this could happen is them storing the specific character separately. It reduces security of your password if that plaintext character is compromised but you could still store the rest of the password securely.
You could even salt and hash the one character with a large salt to keep it behind a one-way function, and then the agent would need to enter it and confirm via the system, but that would reduce any downside of the one or two characters being compromised.
It's weird either way though.