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Re: [ietf-dkim] New version - draft-ietf-dkim-rfc4871-errata-01

2009-02-05 11:49:09
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There is a difference between being able to use the d= signing  
domain versus
having deep knowledge about the underlying intent behind encoding  
choices for it.

You know my name is David.  You do not know why my parents chose  
that name, and
it doesn't matter for your use of it as an identifier.

Let me riff on this for second.

We *don't* know your name is David. We commonly use the identifier  
"Dave" for you, and while it's reasonable to suppose that Dave comes  
from David, we don't know that. If a metaphorical i= has Dave there,  
we can't back-translate to David, error-free.

I mention this because my father's given name is a common nickname. I  
won't bore you with the tale of his immigrant father and  
transliteration of names into the Roman character set, but you get the  
picture.

Like i=, "Dave" is an opaque identifier. One can often peer into the  
opacity and discover that it is translucent, but the process is not  
error-free, and this is why we say in DKIM that it is opaque.

        Jon



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