nanog mailing list archives
Re: AD and enforced password policies
From: Måns Nilsson <mansaxel () besserwisser org>
Date: Tue, 3 Jan 2012 09:44:11 +0100
Subject: RE: AD and enforced password policies Date: Mon, Jan 02, 2012 at 11:15:08PM +0000 Quoting Blake T. Pfankuch (blake () pfankuch me):
However I would say 365 day expiration is a little long, 3 months is about the average in a non financial oriented network.
If you force me to change a password every three months, I'm going to start doing "g0ddw/\ssPOrd-01", ..-02, etc immediately. Net result, you lose. Let's face it, either the bad guys have LANMAN hashes/unsalted MD5 etc, and we're all doomed, or they will be lucky and guess. None of these attack modes will be mitigated by the 3-month scheme; success/fail as seen by the bad guys will be a lot quicker than three months. If they do not get lucky with john or rainbow tables, they'll move on. (Some scenarios still are affected by this, of course, but there is a lot to be done to stop bad things from happening like not getting your hashes stolen etc. On-line repeated login failures aren't going to work because you'll detect that, right? ) Either way, expiring often is the first and most effective step at making the lusers hate you and will only bring the Post-It(tm) makers happy. If your password crypto is NSA KW-26 or similar, OTOH, just don the Navy blues and start swapping punchcards at 0000 ZULU. (http://en.wikipedia.org/wiki/File:Kw-26.jpg) -- Måns Nilsson primary/secondary/besserwisser/machina MN-1334-RIPE +46 705 989668 Life is a POPULARITY CONTEST! I'm REFRESHINGLY CANDID!!
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Current thread:
- AD and enforced password policies Jones, Barry (Jan 02)
- Re: AD and enforced password policies Robert Luethje (Jan 02)
- Re: AD and enforced password policies Jimmy Hess (Jan 02)
- RE: AD and enforced password policies Blake T. Pfankuch (Jan 02)
- Re: AD and enforced password policies Måns Nilsson (Jan 03)
- Re: AD and enforced password policies Greg Ihnen (Jan 03)
- Re: AD and enforced password policies Todd Underwood (Jan 03)
- Re: AD and enforced password policies Michael Thomas (Jan 03)
- Re: AD and enforced password policies Måns Nilsson (Jan 03)
- Re: AD and enforced password policies Tim Franklin (Jan 03)
- Re: AD and enforced password policies Måns Nilsson (Jan 04)
- Re: AD and enforced password policies Randy Bush (Jan 03)
- Re: AD and enforced password policies Todd Underwood (Jan 03)
- RE: AD and enforced password policies Blake T. Pfankuch (Jan 02)
- Re: AD and enforced password policies Steven Bellovin (Jan 03)
- RE: AD and enforced password policies Jones, Barry (Jan 05)