[tor-bugs] #28634 [Core Tor/Tor]: Design a useful padding machine that we can enable

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#28634: Design a useful padding machine that we can enable
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 Reporter:  asn                                  |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  wtf-pad, tor-relay, tor-cell,        |  Actual Points:
  padding, 041-proposed                          |
Parent ID:  #28632                               |         Points:  8
 Reviewer:  mikeperry                            |        Sponsor:
                                                 |  Sponsor2
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Comment (by asn):

 OK I have a new branch in `bug28634`:
 https://github.com/torproject/tor/pull/635
 and I also updated the spec PR:
 https://github.com/torproject/torspec/pull/72

 This branch takes the simplistic approach of only trying to make the
 initial circuit setup cell sequence blend in with general circuits. I find
 this to be more sophisticated than a look-like-nothing and it also has
 minimal overhead.

 Also, this is a fine start if we want to build this into a more advanced
 machine. We can just create new states that handle obfuscation after the
 initial circuit setup sequence.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28634#comment:16>
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