[tor-bugs] #20742 [Core Tor/Tor]: prop224: Implement stealth client authorization

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#20742: prop224: Implement stealth client authorization
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:  asn
     Type:  enhancement                          |         Status:
                                                 |  assigned
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  prop224, needs-proposal,             |  Actual Points:
  prop224-extra, tor-hs, client-authorization,   |
  stealth-authorization, term-project,           |
  035-removed, hs-auth                           |
Parent ID:                                       |         Points:  3
 Reviewer:                                       |        Sponsor:
                                                 |  SponsorR-can
-------------------------------------------------+-------------------------

Comment (by asn):

 Replying to [comment:17 cypherpunks]:
 > hi, as a hsdir for a client, i can watch onion address request? but if
 unique onion address for each authorized client exists, i know it is the
 same client again. since no other would request it :( ? or do i
 misunderstood the spec

 Correct.
 Usually the individual onions of a stealth HS are not known to the
 attacker and are only known to the individual users, so an HSDir is not
 able to distinguish a normal onion from a stealth onion used by just one
 client.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20742#comment:18>
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