As we've mentioned several times, we've been working on a way to retrieve
CT data over DNS to improve the privacy properties of inclusion proofs.

So, I'm pleased to announce that we now have a test DNS service up for some
of our logs.

The documentation for the protocol can be found here:

https://github.com/google/certificate-transparency-rfcs/blob/master/dns/draft-ct-over-dns.md

The base domains for the supported logs are:

aviator.ct.googleapis.com
pilot.ct.googleapis.com
testtube.ct.googleapis.com

and a demo showing use of the DNS records is here:

https://github.com/google/certificate-transparency/blob/master/python/utilities/dnslookup/dnslookup.py

The demo is pretty primitive, but does show all the things you can get from
the DNS.

Comments and improvements welcome.
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