Re: [kitten] draft-ietf-kitten-cammac kdc-verifier omission

Greg Hudson <ghudson@mit.edu> Fri, 13 February 2015 04:38 UTC

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Date: Thu, 12 Feb 2015 23:38:26 -0500
From: Greg Hudson <ghudson@mit.edu>
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To: Tom Yu <tlyu@mit.edu>
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Subject: Re: [kitten] draft-ietf-kitten-cammac kdc-verifier omission
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On 02/12/2015 06:13 PM, Tom Yu wrote:
>> I use MUST NOT instead of SHOULD NOT because[...]
>
> This seems backwards to me; you wrote "KDC SHOULD NOT blindly copy"
> in your suggested text.  Which did you intend?

Sorry, editing error.  I meant to say "I use SHOULD NOT instead of MUST
NOT because...".

> I would like to try to reason about this from a data origin
> authentication standpoint.

Your reasoning about data origin authentication matches my reasoning
about the ways a KDC can safely process an incoming CAMMAC.

> I guess this is a roundabout way of suggesting text that includes:

I have no objection to this presentation and can review the full
alternative section 8 text if you want to write it.  I don't know if
rewriting this much text would necessitate another working group or IETF
last call; that might be a consideration.