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Re: [DNSOP] rfc4641bis: NSEC vs NSEC3.

"W.C.A. Wijngaards" <wouter@NLnetLabs.nl> Mon, 22 February 2010 09:42 UTC

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Date: Mon, 22 Feb 2010 10:44:09 +0100
From: "W.C.A. Wijngaards" <wouter@NLnetLabs.nl>
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Subject: Re: [DNSOP] rfc4641bis: NSEC vs NSEC3.
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On 02/22/2010 04:53 AM, Roy Arends wrote:
> On Feb 21, 2010, at 7:22 PM, Mark Andrews wrote:
> 
>>  NSEC3
>> has a non zero false positive rate due to the fact that the names
>> are hashed.
> 
> Are you going on again about the possibility of hash collisions is SHA-1? 

Yes.  +1 for Marks point.

The deployment of NSEC3-signed toplevel domains is a giant hash
collision test of typo dictionaries.  What does the registry do when
someone registers a new domain name that has a hash-collision (resign
with a new salt, and also keep that 2-second update guarantee? - I would
suggest some weasel words in agreements).

But I agree more pertinent to choice is the increased CPU demand and
larger packets when using NSEC3.  And opt-out, obfuscation desiderata.

Best regards,
   Wouter
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