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

Erik Sy <sy@informatik.uni-hamburg.de> Tue, 20 August 2019 19:30 UTC

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From: Erik Sy <sy@informatik.uni-hamburg.de>
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Date: Tue, 20 Aug 2019 21:30:08 +0200
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Subject: Re: [Resolverless-dns] Paper on Resolver-less DNS
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On 8/20/19 10:10, Ralf Weber wrote:
>>>> Nonetheless, there exists empirical evidence that several popular ISPs
>>>> and Telcos sold data on their customers' online activities to
>>>> advertising companies [1,2,3]. Thus, it is plausible that these
>>>> ISPs and
>>>> Telcos use their DNS resolver to aggregate such user profiles.
>>> Actually, no, it's not plausible.  The mechanisms described in these
>>> papers are nothing like DNS queries.  If they could get enough data
>>> from DNS queries, why would they bother rewriting HTTP headers?
>> They do not use the HTTP header for data collection. Instead, they use
>> the injected HTTP header to  communicate the tracking identifier between
>> the ISP and the advertising company as shown in this figure:
>> https://jonathanmayer.org/stable/blog_images/verizon_header/verizon_header.png
>>
> But again it has nothing to do with DNS or selling DNS data. I’ve
> worked with
> lots of ISP/Telcos around the globe and most of them were very aware
> of the
> privacy aspect of DNS data and treated it with great care.
>
Ok, as a matter of fact we have evidence that some ISPs collected data
on their customers' private online activities with the intention to sell
this information to advertising companies. Your standpoint is, that this
has nothing to do with the ISP's DNS resolver or selling DNS data. I
have no explanation why an ISP should apply better privacy protections
to their customers DNS data compared to the customers network traffic
because both enable a significant monitoring of the users' online
activities. Do you have an explanation for this?

Erik