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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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Any password length (within reason) and any character should be allowed. It's going to be hashed and only the hash will be stored right? Length and character limits make me suspect it's being stored in plain text.
Then you're vulnerable to simple brute force attacks, which if paired with a dumped hash table, can severely cut the time it takes to solve the hash and reveal all passwords.
By any length I meant no maximum length. Obviously you don't want to use a super short password.
"What's your password?"
"The letter A."
Mine is the null string. They'll never guess it!
Some kind of upper bound is usually sensible. You can open a potential DoS vector by accepting anything. The 72 byte bcrypt/scrypt limit is generally sensible, but going for 255 would be fine. There's very little security to be gained at those lengths.
I do 256 so I hopefully never need to update it, but most of my passwords are 20-30 characters or something, and generated by my password manager. I don't care if you choose to write a poem or enter a ton of unicode, I just need a bunch of bytes to hash.