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NIST proposes barring some of the most nonsensical password rules
(arstechnica.com)
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this post was submitted on 26 Sep 2024
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That's a pepper not a salt. A constant value added to the password that's the same for every user is a pepper and prevents rainbow table attacks. A per-user value added is a salt and prevents a number of things, but the big one is being able to overwrite a users password entry with another known users password (perhaps with a SQL injection).