On Fri, Sep 18, 2015 at 9:54 AM, Alec Muffett <al...@fb.com> wrote: > > On Sep 18, 2015, at 14:16, George Michaelson <g...@algebras.org> wrote: > > ... > > XXXXXXXX.onion is *not* a domain name inside the .onion part: as I > understand it, the value is a hash, or other function which has no nesting > properties expressed syntactically. > > > Hi, my name's Alec, I work for Facebook and lead the engineering team for > Facebook over Tor. > > You are certainly correct that the label immediately left of ".onion" is a > hash, and functions not unlike a layer-3 address; however, there may be > other labels leftwards of the hash, under (to some extent) other > administrative control. > > The canonical example of this would be: www.facebookcorewwwi.onion versus > m.facebookcorewwwwi.onion > ...
> - alec > > I would argue that "facebookcorewww" is a domain within the "onion" domain, and that the "www" and "m" here are within the "facebookcorewww" domain. I also think that the fact that the 'name' of the domain happens to be a hash is significant, it is merely the 'name' of the domain, and how the name is chosen is not what defines a domain. We might even say that the actual domain could be considered to be the private information that the hash is created from, or the service, or address (however Tor finds the resource).
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