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For some reasons that you might want to reconsider this, see:
http://www.cerias.purdue.edu/weblogs/spaf/general/post-30/
and
http://www.smat.us/sanity/expharmful.html

Why do you think a 30-day expiration "is absolutely essential"? 

> -----Original Message-----
> From: MSU Network Administrators Group 
> [mailto:[log in to unmask]] On Behalf Of Bryan Murphy
> Sent: Tuesday, May 16, 2006 11:47 AM
> To: [log in to unmask]
> Subject: [MSUNAG] Password Expiration Policies
> 
> Hi Guys,
> 
> I am about to implement a password policy that calls for 
> password expiration every 30 days.  I have run my policy by a 
> small group of faculty and found that this (as I suspected) 
> is the only point of contention in the policy.
> 
> From a security stand point this is absolutely essential for 
> a number of reasons, and I have explained these reasons but 
> still get guff.
> 
> For some reason stating "department x has this same policy" 
> or "x % of the departments on campus already do this" works 
> far better than logical explanations... So I was wondering if 
> anyone in NAG'Land would mind sharing what they are doing for 
> departmental password policies.
> 
> Thank you.
> 
> ,--------------------------------------------+----------------
> -------------,
> | Bryan Murphy, CISSP                        | 
> [log in to unmask]  |
> | Information Technology Coordinator         |       
> 517.432.5939 w        |
> | MSU Plant Research Lab & Plant Biology     |      
> 517.355.1926 fax       |
> | 132a Plant Biology Bldg.                   | 
> http://infotech.prl.msu.edu |
> '--------------------------------------------+----------------
> -------------'
>