[ietf-dkim] Base issue: multiple linked signatures

[Charles Lindsey]

On Thu, 04 Jan 2007 14:23:06 -0000, Hallam-Baker, Phillip  
<pbaker at verisign.com> wrote:

>> [mailto:ietf-dkim-bounces at mipassoc.org] On Behalf Of Charles Lindsey
>
>> I just want to point out that similar arguments also apply to
>> the "MUST sign the From header" case.
>
> I disagree, I can easily write a test vector for that MUST so it is  
> emprically verifiable. Hence it can be made a MUST.

True. Perhaps I overstated my case. However, it still conflicts with RFC  
2119, since no interoperabilty arises (the sky does not fall in) if you  
fail to sign the From. All that happens is that people might suppose it is  
not always a good idea (and they m,ay even turn out to be right in some  
cases). But you are not supposed to use "MUST" for that. "SHOULD" would be  
quite strong enough.

-- 
Charles H. Lindsey ---------At Home, doing my own thing------------------------
Tel: +44 161 436 6131                       
   Web: http://www.cs.man.ac.uk/~chl
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