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Thread: Proposed Resolution to Issue 362: Lower layer parameters and EMSK text




Proposed Resolution to Issue 362: Lower layer parameters and EMSK text
user name
2006-06-24 21:08:38
Vidya said:

"> As noted in [RFC3748] Section 7.10:
>
>    The EMSK is reserved for future use and MUST remain
on the EAP
>    peer and EAP server where it is derived; it MUST NOT
be
>    transported to, or shared with, additional parties,
or used to
>    derive any other keys."

Are we sticking to this rule that the EMSK MUST NOT be used
to derive
any other keys? Given that there is agreement in general
about potential
derivation of keys from the EMSK, what implications does
this text have
to future documents specifying derived keys from the
EMSK?"

[BA] Since this is a quotation from [RFC3748] rather than
anything created 
in this document, we can delete the quote.  Don't think it
adds much anyway.

[Vidya]

>On the EAP server, keying material and parameters
requested by and passed 
>down to the AAA layer may be replicated to the AAA layer
on the 
>authenticator.

I understand what the above is trying to say - however, this
does
conflict with the fact that the EMSK MUST NOT be transported
to the
authenticator (even though it may be passed down to the AAA
layer on the
server). I wonder if some clarification is necessary to
avoid confusion.

[BA] How about this?

"On the EAP server, keying material and parameters
requested
by and passed down to the AAA layer may be replicated to the
AAA layer on the authenticator (with the exception of the
EMSK)."


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Proposed Resolution to Issue 362: Lower layer parametersand EMSK text
user name
2006-06-26 17:17:26
> 
> Vidya said:
> 
> "> As noted in [RFC3748] Section 7.10:
> >
> >    The EMSK is reserved for future use and MUST
remain on the EAP
> >    peer and EAP server where it is derived; it
MUST NOT be
> >    transported to, or shared with, additional
parties, or used to
> >    derive any other keys."
> 
> Are we sticking to this rule that the EMSK MUST NOT be
used 
> to derive any other keys? Given that there is agreement
in 
> general about potential derivation of keys from the
EMSK, 
> what implications does this text have to future
documents 
> specifying derived keys from the EMSK?"
> 
> [BA] Since this is a quotation from [RFC3748] rather
than 
> anything created in this document, we can delete the
quote.  
> Don't think it adds much anyway.
> 

Ok. 

> [Vidya]
> 
> >On the EAP server, keying material and parameters
requested by and 
> >passed down to the AAA layer may be replicated to
the AAA 
> layer on the 
> >authenticator.
> 
> I understand what the above is trying to say - however,
this 
> does conflict with the fact that the EMSK MUST NOT be 
> transported to the authenticator (even though it may be

> passed down to the AAA layer on the server). I wonder
if some 
> clarification is necessary to avoid confusion.
> 
> [BA] How about this?
> 
> "On the EAP server, keying material and
parameters requested 
> by and passed down to the AAA layer may be replicated
to the 
> AAA layer on the authenticator (with the exception of
the EMSK)."
> 

Sounds good to me. 

Vidya
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