Re: [Resolverless-dns] Paper on Resolver-less DNS

Erik Sy <sy@informatik.uni-hamburg.de> Mon, 19 August 2019 20:25 UTC

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From: Erik Sy <sy@informatik.uni-hamburg.de>
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Date: Mon, 19 Aug 2019 22:25:13 +0200
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Subject: Re: [Resolverless-dns] Paper on Resolver-less DNS
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On 8/19/19 18:10, Anne Bennett wrote:
> I dispute the idea that DNS over TLS addresses the privacy
> problem of the resolver operator having access to all of a
> user's DNS queries.
>
> That being said, I think that stating that traditional DNS has the
> "real privacy problem", and implying that resolverless DNS doesn't
> suffer from a similar problem, is disingenuous.

Ok, I assume we agree on a traditional DNS resolver being able to
monitor the user's online activities, right?
Resolver-less DNS is different as the web server does not learn anything
new about it's users when serving DNS records because it just provides
the user with some relevant DNS records. Note, that there does not exist
a concept for DNS queries in resolver-less DNS. Furthermore,
resolver-less DNS is a decentralized approach where there does not exist
a single entity being able to monitor the full scope of the user's
online activities. I hope this clarified the privacy difference of the
two DNS mechanisms.

>
> If I ask a question and expect an answer, *someone* has to hear my
> question!  Who would I rather trust: an ISP whose services I pay for,
> or a commercial web site where most likely, I *am* the product? 

In resolver-less DNS you do not trust retrieved DNS records because you
validate these records. In my view, this is a significant benefit of
resolver-less DNS as there exist evidence for DNS manipulations
conducted by ISPs [1].

Erik

1:
https://www.usenix.org/system/files/conference/usenixsecurity17/sec17-pearce.pdf