On Wed, 20 Aug 2014, Jacob Appelbaum wrote:

Paul - perhaps this suggests that all stub and recursive resolvers
should log keying information, even if it isn't used for
validation/authentication/etc?

That is one "out of band" authentication mechanism called TOFU (trust on
first use) or LOF (Leap of Faith)

While possible, it will see a lot of false positives, like when going to
a different starbucks using the same wifi ESSID.

It could be done if one also logs mac address and/or lat/long info.

But these are all local policy and local implementations issues.

Paul

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