[tor-bugs] #23621 [Core Tor/Tor]: prop224: Missing tons of mds over time with a lurking client

[Tor Bug Tracker & Wiki]

#23621: prop224: Missing tons of mds over time with a lurking client
--------------------------+------------------------------------
 Reporter:  asn           |          Owner:  dgoulet
     Type:  defect        |         Status:  needs_review
 Priority:  Medium        |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor  |        Version:  Tor: 0.3.2.1-alpha
 Severity:  Normal        |     Resolution:
 Keywords:  prop224       |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by arma):

 The {{{ClientUsageDelay}}} feature here, when set to exactly 1 hour, will
 have interesting side-channel leaks. For example, if you go to a directory
 guard to fetch new microdescs, it knows that there's a good chance you had
 been idle but you just sent something on an existing circuit to your
 primary guard.

 Mike worked hard to remove those side channels in the #17592 fix (see e.g.
 commit d5a151a0).

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23621#comment:10>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online