[tor-bugs] #8106 [Tor]: Make .onion addresses harder to harvest by directory servers

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#8106: Make .onion addresses harder to harvest by directory servers
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     Reporter:  asn     |      Owner:
         Type:  defect  |     Status:  new
     Priority:  major   |  Milestone:  Tor: 0.2.5.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  SponsorZ tor-hs
Actual Points:          |  Parent ID:
       Points:          |
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Comment (by asn):

 I started writing the crypto part of the proposal
 (https://lists.torproject.org/pipermail/tor-dev/2013-October/005534.html)
 and I think I understood why Robert prefers the variation where the base
 point is blinded.

 If the base point is blinded, the ed25519 verification equation remains
 the same. If we don't blind the base point, the original unblinded public
 key appears in the equation and HSDirs are not supposed to know it.

 There might be a smart multiplication somewhere there that would make the
 unblinded public key disappear from the equation, but I don't see it
 currently.

 I attached my notes in attachment:hs_notes.jpg which are hopefully cleaner
 than math equations in Trac.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8106#comment:29>
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