Firewall Wizards mailing list archives
Re:password aging
From: "Harvey Nusz" <Harvey_Nusz () administaff com>
Date: Wed, 19 Aug 1998 14:06:00 -0500
Adam, no paper per se (to my knowledge), but industry/ good sense practice, and any limitations of the software package/ storage space involved. Generally, a year is preferred. Also, watch out for people changing it 12 times in one hour/ day, just to use be able to use the same PW again, contiguously. The better "packages" let you limit users changing it before, say, 10 days, unless it is needed (user has concerns about it being compromised). Also, hopefully, monitoring can find those consistently changing their PW after 10 days, or whatever the minimum is, to go back to their original PW or to their one alternative PW (that they switch back and forth between). Hope this helps. Harvey 800.242.8893, ext. 3923 ____________________Reply Separator____________________ Subject: password aging Author: adam () weathership homeport org (Adam Shostack) Date: 8/18/98 3:57 PM Various people assert that its a good idea to maintain a history of user passwords so that they can't change their password to a previous password. However, I'm having trouble finding a reference to this in the literature that examines the issue of how many passwords to save and why. The lime green book (password management) says not to let the user use their previous password, but doesn't go into storing a history. Does anyone know of a paper on, or that discusses, this topic, and how or why to pick various values of N? Adam
Current thread:
- password aging Adam Shostack (Aug 19)
- Re: password aging Rick Smith (Aug 23)
- <Possible follow-ups>
- Re: password aging Steve Bellovin (Aug 19)
- Re: password aging R. DuFresne (Aug 23)
- Re:password aging Harvey Nusz (Aug 19)
- Re: password aging HASSAN . KARIM (Aug 19)
- Re: password aging H. Morrow Long (Aug 23)
- Re: password aging Adam Shostack (Aug 24)
- Re: password aging Paul M. Cardon (Aug 26)
- Re: password aging Stephen P. Gibbons (Aug 27)
- Re: password aging Massimo Brogioni (Aug 27)
- Re: password aging John McDermott (Aug 24)
- Re: password aging Paul McNabb (Aug 28)
- Re: password aging Stephen P. Gibbons (Aug 28)
- Re: password aging Paul McNabb (Aug 28)
(Thread continues...)