At 12:29 PM -0400 4/18/06, Hector Santos wrote:
----- Original Message -----
From: "Paul Hoffman" <phoffman(_at_)proper(_dot_)com>
To: <ietf-dkim(_at_)mipassoc(_dot_)org>
Sent: Tuesday, April 18, 2006 11:38 AM
Subject: Re: [ietf-dkim] Expiration Tag (x=) is required to minimize DNS
lookups.
At 2:34 PM +0000 4/18/06, Mark Delany wrote:
>This is surely an edge case that Knuth warns us about.
+1
The current spec has enough language to handle key rollover
gracefully. Further, if a sender wants to minimize DNS lookups, the
DNS TTL is the perfect tool, and is already implemented everywhere.
But it still an optimization concept:
- No need to DNS lookup, regardless of TTL state.
A cached DNS lookup only goes to a local DNS responder. There is no
need to optimize past that.
- No need to do any SHA256 Hashing on a potential HUGE payload.
This has nothing to do with minimizing DNS lookups, the topic of this thread.
This is clearly an optimization any good engineer will see.
Then I guess I'm a bad engineer in your eyes. Oh, well.
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