[tor-bugs] #23474 [Core Tor/Tor]: Avoid constant initial download delays in download schedules

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#23474: Avoid constant initial download delays in download schedules
--------------------------+------------------------------------------------
     Reporter:  teor      |      Owner:  (none)
         Type:  defect    |     Status:  new
     Priority:  Medium    |  Milestone:  Tor: 0.3.3.x-final
    Component:  Core      |    Version:
  Tor/Tor                 |
     Severity:  Normal    |   Keywords:  fingerprint-resistance, tor-client
Actual Points:            |  Parent ID:
       Points:  0.5       |   Reviewer:
      Sponsor:            |
--------------------------+------------------------------------------------
 When a download schedule has a non-zero initial delay, the delay is used
 as-is. We use this to delay the initial authority consensus download (so
 fallbacks get used), and bridge descriptor re-downloads.

 But these constant delays produce an obvious traffic pattern, so we should
 work out how to randomise them. Using a random value from [delay/2,
 delay*3/2] would be a good start.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23474>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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