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NIST proposes barring some of the most nonsensical password rules (arstechnica.com)

submitted 1 month ago by Amicitas@lemmy.world to c/technology@lemmy.world

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Here is the text of the NIST sp800-63b Digital Identity Guidelines.

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[–] lvxferre@mander.xyz 335 points 1 month ago (76 children)

Reworded rules for clarity:

Min required length must be 8 chars (obligatory), but it should be 15 chars (recommended).

Max length should allow at least 64 chars.

You should accept all ASCII plus space.

You should accept Unicode; if doing so, you must count each code as one char.

Don't demand composition rules (e.g. "u're password requires a comma! lol lmao haha" tier idiocy)

Don't bug users to change passwords periodically. Only do it if there's evidence of compromise.

Don't store password hints that others can guess.

Don't prompt the user to use knowledge-based authentication.

Don't truncate passwords for verification.

I was expecting idiotic rules screaming "bureaucratic muppets don't know what they're legislating on", but instead what I'm seeing is surprisingly sane and sensible.

[–] catloaf@lemm.ee 59 points 1 month ago (23 children)

I hate that anyone has to be told not to truncate passwords. Like even if you haven't had any training at all, you'd have to be advanced stupid to even come up with that idea in the first place.

[–] einlander@lemmy.world 24 points 1 month ago (4 children)

Microsoft used to do that. I made a password in the late 90's for a we service and I found out that it truncated my password when they made it after it warned my my password was too long when I tried to log in. It truncated at 16 characters.

[–] chiisana@lemmy.chiisana.net 1 points 1 month ago

The LM password hash (predecessor to NTLM) was calculated in two blocks of 7 characters from that truncated 14 characters. Which meant the rainbow table for that is much smaller than necessary and if your password is not 14 characters, then technically part of the hash is much easier to brute force, because the other missing characters are just padded with null.

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