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Additional lookups (was Re: [ietf-dkim] Re: 1368 straw-poll)

2007-02-27 17:28:59
Paul Hoffman wrote:
At 8:48 AM -0800 2/26/07, Dave Crocker wrote:
The proposed mechanism incurs an additional lookup for every signed message.

You keep saying this without justifying it. Others have shown it to be wrong. Please stop repeating it or support your statement.
Absent this mechanism, a message which has at least one valid signature on behalf of the From address [assuming some other decisions that are pending] does not need to consult SSP.

With a mechanism in SSP to specify the signature algorithms that should be present, it is always necessary to consult SSP to find out the list of required signature algorithms. This, I believe, is the additional lookup for every signed message to which Dave refers.

Mark Delany mentioned that this information could be included in the selector records (presumably via an extension, since this isn't in -base). This would remove the need to consult SSP on signed messages, but then it's not clear that it's an SSP mechanism any more.

-Jim
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