ietf-dkim
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Re: [ietf-dkim] New Issue: Overview service-type and delegation

2008-03-24 23:56:01
ignore this message.

<wet noodle time>

Never post messages close to 2 am.

</wet noodle time>

sigh

        Tony Hansen
        tony(_at_)att(_dot_)com

Tony Hansen wrote:
um, erm, ahem

ss 4.1 para 3 is supposed to be talking about the use of the s= selector 
value to choose which signature key is being used.

But Jim mistook the paragraph to be talking about the s= service type 
value that can be found *within* a signature key.

This indicates to me that our text led Jim astray.

    Tony Hansen
    tony(_at_)att(_dot_)com

Dave Crocker wrote:
Jim Fenton wrote:
Section 4.1 paragraph 3 talks about the service type (s=) constraint 
in key records, and goes on to say that it is helpful when delegating 
signing authority.  s= was included to provide expansion capability 
should, at some point, some service other than email decide to use 
DKIM.  If and when some other service does use DKIM, the ability to 
constrain a key to signing email only would help delegation.  In the 
meanwhile, there isn't any benefit to delegation as a result of s=.

I suggest that the paragraph be deleted.


You suggest having the DKIM Overview make no comment on the s= parameter?

The signing specification's explanatory text for s= is:

    "This tag is intended to constrain the use of keys for other 
purposes".

If there is something inaccurate in the Overview text, what is it?

As for "included to provide expansion capability", I don't understand 
what this means.  The signing spec text says it was included for a 
different purpose, but that it *includes* an expansion capability, to 
list other services.

You further seem to indicate that s= is not currently useful but would 
be if it listed other services.  (I well might be misunderstanding 
this part of your text.)  In any event, either the capability has 
currently utility, or it was a mistake to put it in the spec.  Which 
are you saying?

d/



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