Re: [DNSOP] New Version Notification for draft-wessels-dns-zone-digest-01.txt

Mark Andrews <marka@isc.org> Fri, 27 July 2018 04:18 UTC

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From: Mark Andrews <marka@isc.org>
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Date: Fri, 27 Jul 2018 14:18:46 +1000
Cc: Evan Hunt <each@isc.org>, steve@shinkuro.com, dnsop <dnsop@ietf.org>, mweinberg=40verisign.com@dmarc.ietf.org
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To: Davey Song <songlinjian@gmail.com>
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Subject: Re: [DNSOP] New Version Notification for draft-wessels-dns-zone-digest-01.txt
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Davey,
	just because A => B, it doesn’t mean that !B => !A.  Your
        analysis is flawed.
Mark

> On 27 Jul 2018, at 2:13 pm, Davey Song <songlinjian@gmail.com> wrote:
> 
> 
> 
> On Fri, 27 Jul 2018 at 12:04, Evan Hunt <each@isc.org> wrote:
> On Fri, Jul 27, 2018 at 11:24:33AM +0800, Davey Song wrote:
> > The draft says zone digest is not for protecting zone transmition.
> 
> Where did it say that? I didn't notice it.
> 
>  I mean zone digest is not for zone transimition with channel security. On page 4, the authors compare zone digest and Channel security.
> 
>    Unfortunately, the protections provided by these channel security
>    techniques are ephemeral and are not retained after the data transfer
>    is complete.  They can ensure that the client receives the data from
>    the expected server, and that the data sent by the server is not
>    modified during transmission.  However, they do not guarantee that
>    the server transmits the data as originally published, and do not
>    provide any methods to verify data that is read after transmission is
>    complete.  For example, a name server loading saved zone data upon
>    restart cannot guarantee that the on-disk data has not been modified.
>    For these reasons, it is preferable to secure the data itself.
> 
>  Davey
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Mark Andrews, ISC
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