[tor-bugs] #25066 [Core Tor/Tor]: Rendezvous points should return signed proof of the established rend point

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#25066: Rendezvous points should return signed proof of the established rend point
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 Reporter:  arma                                 |          Owner:  (none)
     Type:  enhancement                          |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  needs-proposal,                      |  Actual Points:
  034-triage-20180328, 034-removed-20180328      |
Parent ID:  #29999                               |         Points:  15
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor27-can
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Comment (by cypherbits):

 Replying to [comment:10 arma]:
 > To set expectations here: I think adding a proof-of-rendezvous-point to
 the design is a wild and crazy idea. It would be great to have a simpler
 and cleaner idea that helps solve the problem instead.
 >

 The goal is to check the client actually established the rend point
 circuit... the only idea I have in mind is that the rend point signs the
 cookie. It should not be that expensive.
 Now, that would be if it is the Hidden Service verifying the signature,
 but, what if we want it to be the Intro Point? Where to do the verify
 process?

 I will make a proposal but before that I will have to analyze everything I
 can to choose where.

 > (And to respond to cypherbits's point, yes it can potentially help with
 future DoS issues, but we should also remember that it would not help with
 the current DoS issues, because as far as I know they really are
 establishing rendezvous points and otherwise following the protocol.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25066#comment:11>
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