this post was submitted on 27 Jul 2023
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That's the point though.
You're not supposed to have the old password. If you had the old password you could just compare it to the new password.
The only way you can do it is to take the new password and make a hash for every possible single-character variation and compare them all to the old hash
Sorry, that's what I meant as well :) Came out upside down when I wrote. We used to figure out shitty ISP router passwords this way by having a table of common passwords and their hashes.