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RE: [HOKEY] EMSK Issue

2008-03-30 22:32:55
Hi Vidya,

I think this is an excellent start.  I'll put some applicability and
security considerations text together for the document for discussion on
the list.  

Cheers,

Joe 

-----Original Message-----
From: hokey-bounces(_at_)ietf(_dot_)org 
[mailto:hokey-bounces(_at_)ietf(_dot_)org] 
On Behalf Of Narayanan, Vidya
Sent: Monday, March 24, 2008 11:27 AM
To: Charles Clancy
Cc: ietf(_at_)ietf(_dot_)org; hokey(_at_)ietf(_dot_)org; Bernard Aboba
Subject: Re: [HOKEY] EMSK Issue

Charles,

-----Original Message-----
From: Charles Clancy [mailto:clancy(_at_)cs(_dot_)umd(_dot_)edu]
Sent: Sunday, March 23, 2008 7:18 PM
To: Narayanan, Vidya
Cc: Glen Zorn; ietf(_at_)ietf(_dot_)org; hokey(_at_)ietf(_dot_)org; Bernard 
Aboba
Subject: Re: [HOKEY] EMSK Issue

Vidya,

 > ... do the responsible thing, which would be to clearly 
define the  
applicability, along with providing an interoperable means of 
defining  > the key hierarchy for those usages that want to/can use 
it.

This is all I'm suggesting we do.  I think we should add 
text to the 
document that gives guidance on the types of usages for 
which a USRK 
would be appropriate.  Usages should be for functions 
related to the 
access network to which you are connecting, and for 
functions where it 
is reasonable for your access network to have an interest in 
authorization.


How about the following text for applicability: 

"It must be noted that any application of EAP keying material 
to other usages such as handoffs, IP mobility or other 
applications is only feasible when those services are 
provided either by or through the provider handling network 
access.  It is also only feasible when those usages only 
occur over EAP-capable interfaces. Hence, deriving USRKs or 
DSUSRKs for usages other than those facilitated by the 
network access provider is NOT RECOMMENDED." 

Thanks,
Vidya
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