Created 3 months ago: https://trac.torproject.org/projects/tor/ticket/8244 The "rpw" that is CC'ed on that bug report is one of the authors of the paper above, so the Tor devs have privately known about this issue for three months prior to the publication of this research. The milestone is Tor 0.2.5. Version 0.2.4 should be moving to stable/final within the next few weeks, since there are only 8 tickets to resolve: https://trac.torproject.org/projects/tor/milestone/Tor%3A%200.2.4.x-final When that happens, 0.2.5 will be available in the experimental repo. That doesn't mean it will have this feature immediately, but hopefully within a few months.