[tor-bugs] #19045 [Core Tor/Tor]: Keep trying to form a new shared random value during the next commit phase

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu May 12 19:56:31 UTC 2016


#19045: Keep trying to form a new shared random value during the next commit phase
------------------------------+--------------------------
     Reporter:  teor          |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  029-proposed
Actual Points:                |  Parent ID:  #16943
       Points:                |   Reviewer:
      Sponsor:                |
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 Currently, the shared random system treats the first vote of the next
 commit phase specially - it's the only time it tries to agree on a new
 shared random value.

 But we can try to agree 12 times on a new shared random value like this:
 * for the first consensus in the new commit period:
   * vote the calculated shared random value;
 * for subsequent consensuses in the new commit period:
   * if we have an agreed shared random value from a trusted, previous
 consensus in the period, vote that value;
   * if not, (if the new shared random value is missing from the consensus,
 or there is no trusted consensus), continue to vote our calculated value.

 This way, we try up to 12 times to agree on a shared random value. (But we
 never change an agreed value after we've agreed on it.)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19045>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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