Slashdot Mirror
The Man Who Wrote the Password Rules Regrets Doing So (gizmodo.com)
New submitter cdreimer writes: According to a report in The Wall Street Journal (Warning: source may be paywalled, alternative source), the author behind the U.S. government's password requirements regrets wasting our time on changing passwords so often. From the report: "The man who wrote the book on password management has a confession to make: He blew it. Back in 2003, as a midlevel manager at the National Institute of Standards and Technology, Bill Burr was the author of 'NIST Special Publication 800-63. Appendix A.' The 8-page primer advised people to protect their accounts by inventing awkward new words rife with obscure characters, capital letters and numbers -- and to change them regularly. The document became a sort of Hammurabi Code of passwords, the go-to guide for federal agencies, universities and large companies looking for a set of password-setting rules to follow. The problem is the advice ended up largely incorrect, Mr. Burr says. Change your password every 90 days? Most people make minor changes that are easy to guess, he laments. Changing Pa55word!1 to Pa55word!2 doesn't keep the hackers at bay. Also off the mark: demanding a letter, number, uppercase letter and special character such as an exclamation point or question mark -- a finger-twisting requirement." "Much of what I did I now regret," Bill Burr told The Wall Street Journal. "In the end, [the list of guidelines] was probably too complicated for a lot of folks to understand very well, and the truth is, it was barking up the wrong tree."
My university recently instituted this retarded system that we have to change every 90 days.
And they remember the last 5 or so hashes (one can only hope they don't remember the actual password), so you can't even switch back and forth.
Absolute bullshit.
I remember my dad just changed his every month and he just had MMYY at the end of every password.
LONG PASSWORDS.
The exponent of the equation (alphabet_size)^(length of password) matters MUCH more than the mantissa.
Put another character on the end of an alphanumeric password and you're doing more than selecting even the weirdest of keyboard-typeable symbols.
And the change-your-password-every-X-days was always junk and just provide a route for social engineering of the password reset process on a pre-determined schedule. If your password hasn't been compromised in a reasonable time, it's not going to be compromised. If your system LETS you try trillions of passwords, it's game over whether you change every week or not.
Those who require passwords really ought to take a look at it.
https://xkcd.com/936/
In America, if you admit to making a mistake, your statement may be used against you in a lawsuit. It is best to consult with an attorney before making any admission.
5 years ago, our client insisted that we implement this sort of mischief on one site, with a 30-day change rule. One of the requirements was to check that the new password was not previously used or too similar to a previously-used PW.
"How does that work when you also tell us we cannot save the PW in plain text?"
To their credit, they admitted that it wasn't possible to comply with all the rules. But they have not yet relented on the 30 day change rule.
Which bit them big time during one of their security sweeps - the PW for the scanner's account "expired" part way through the testing. The subsequent lock-out for excessive failed login attempts was then interpreted as "server becomes unresponsive if excessive characters are injected at login." (we'll accept up to 32MB for passwords)