[tor-bugs] #29174 [Core Tor/Tor]: Guard Node can eclipse the hidden service

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#29174: Guard Node can eclipse the hidden service
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 Reporter:  TBD.Chen               |          Owner:  (none)
     Type:  defect                 |         Status:  new
 Priority:  Very High              |      Milestone:
Component:  Core Tor/Tor           |        Version:  Tor: 0.3.0.1-alpha
 Severity:  Critical               |     Resolution:
 Keywords:  guard, hidden service  |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by mikeperry):

 Replying to [comment:2 nickm]:
 > mikeperry, is this the kind of thing that pathbias is meant to solve?

 If we want the path bias system to check for cases like this, it would not
 be to hard to augment it to send periodic end-to-end probes for introduce1
 circuits, fwiw. We should consider if we want to to that for other
 circuits too.

 I was hopeful that Proposal 295 (or 261 or similar) would allow us to
 remove the path bias code, as crypto tagging attacks would be prevented by
 that. However, circuit choking attacks would not be; we would need
 liveness probes to detect them. End-to-end liveness probes might also help
 with conflux (to more quickly detect when a circuit branch has collapsed
 to build another path).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29174#comment:4>
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