ietf-dkim
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Re: [ietf-dkim] Interesting Dupe Signatures

2009-11-01 14:50:50
But I have to consider customer sites patterns with heavy facebook
users seeing tons of fb notifications and see if a simple check can
add to the optimization.

Assuming you make the generally useful optimization to do the body
hash only once, it's hard to see a significant load from an extra
signature check.  

If it's the same signature, you'll already have the validation key in
the DNS cache, so it's just the cost of the header hash, which will be
small since headers are small, and the signature verification.

R's,
John
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