According to


"There have been multiple studies that have shown requiring frequent password changes to actually be counterproductive to good password security..."

I would like to see some of these studies and would appreciate references.

  • 1
    Per would likely have studies: blog.keepersecurity.com/2016/11/16/… I'll try to dig some out.
    – schroeder
    Commented May 18, 2017 at 16:15
  • Most of the time when I ask people in the office whether their passwords are ending with an increasing number, they are maintaining a guilty silence. Of course it is good to have official studies, but you can also just look around. Commented May 18, 2017 at 16:15
  • Thomas, you'll find links to the only studies on password expiration, that I'm aware of, in the 'possible duplicate' linked answers. There are also a few less formal studies like isc.sans.org/forums/diary/…
    – PwdRsch
    Commented May 18, 2017 at 17:12

1 Answer 1


There was a healthy debate a couple of years back here, I hope it's stickied. Lets see: How does changing your password every 90 days increase security? was where we had this.

The NIST itself gathers feedback from industry, government agencies (most specifically: the intelligence community) and provides guidelines to government as to how to secure their systems against nations stealing them. I realize that's an appeal to authority and not a reference, but hopefully it helps provide context for the NIST.

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