On Mon, Apr 6, 2015 at 8:25 AM, Michael Jack Assels < [email protected]> wrote:
> In both documents, there's a conspicuously missing item that would make > list subscribers -- and owners -- a lot happier: A mechanism for changing > the RFC5322.Subject header. Since most lists nowadays add something like > "[list-name] " immediately after "Subject: " in the originating Author's > message, they still won't pass DKIM validation even after complying > with the proposed body modification rules. Would it not be fairly > easy to add an easily reversible "change-subject" transformation to > draft-kucherawy-dkim-transform document, along with a corresponding "cs" > DKIM-Signature tag? Assuming that the mediated RFC5322.From header is > unchanged, this would make it fairly simple for the originating Author's > message to be reconstructed from the message delivered to list members. > But perhaps it might be better to put header transformations in a > separate draft. > It's conspicuously missing mainly because of the thread from last week that talks about why we avoided dealing with Subject: tagging during the original development of DKIM. However, if consensus is that this general approach is viable, then yes, it would be possible to have a second set of additional reversible mutations such as this. The difference in this case is that the list is taking responsibility for the mutations by signing the mutated form. The advantage of this method over the CDKIM or "v=2" method is that it's purely incremental to DKIM, so we don't have to touch RFC6376. -MSK
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