[tor-bugs] #23079 [Core Tor]: Support 80-bit Onion Model In Perpetuity

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#23079: Support 80-bit Onion Model In Perpetuity
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     Reporter:  cypherpunks  |      Owner:
         Type:  project      |     Status:  new
     Priority:  Very High    |  Milestone:
    Component:  Core Tor     |    Version:
     Severity:  Blocker      |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
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 As has been outlined by various persons on IRC, the email lists, onion
 services and even clearnet blogs, over the recent years ever since prop224
 came to be proposed...

 The current 80-bit model of onion addressing needs to be continued in
 perpetuity[1] as a legacy compatibility mode of onion addressing.

 This mode has proven critical to users and communities in onionland that
 use OnionCat, OnionVPN, and other tools to achieve various communication
 models and application support, including interoperation with other
 networks, that is highly relavant to them.

 It is expressly understood by this userbase that this legacy, perhaps even
 parallel, mode of operation will entail tradeoffs to prop224, including
 potentially enhanced anonymity risks, among other risks, and that code and
 bug support may be delayed vs prop224, and that those and other tradeoffs
 and issues are deemed acceptable to the legacy community.

 [1] Or at least until a formal bi-directional resolution layer / registry
 / DHT or other mechanism is developed for prop224 (or any subsequent
 addressing proposal), for which in part, at least a deterministic 40+80 =
 resultant 128-bit IPV6 network stack interface compatible mode of
 operation is available that can supply what OnionCat/OnionVPN do today.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23079>
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