#22422: Add noise to PaddingStatistics --------------------------+------------------------------------ Reporter: teor | Owner: Type: defect | Status: new Priority: High | Milestone: Tor: 0.3.1.x-final Component: Core Tor/Tor | Version: Tor: 0.3.1.1-alpha Severity: Normal | Resolution: Keywords: privcount | Actual Points: Parent ID: | Points: 0.5 Reviewer: | Sponsor: --------------------------+------------------------------------ Changes (by teor):
* cc: robgjansen, amj703 (added) * keywords: => privcount Comment: Replying to [comment:6 mikeperry]: > To know how many padding cells to expect for a client, we need information on how long an average client's connection lasts, Using closed connections to count clients (and also not quite the time interval you're after): "Tor has about 700 thousand unique clients connecting to the network during an average 10-minute interval." > how often they make connections during a 24 hour interval, "Compared to Tor’s own estimate of about 1.75 million clients per day in May 2016..., this suggests that the client population turns over about 2.5 times a day." > and what percentage of the time those connections are idle. Do we have this data? "Somewhat surprisingly, we found that about 130 thousand clients have in- active circuits during an average 10 minutes." (That is, closed connections with no circuits with more than 8 cells either sent or received.) > Also, is there a good example of where we add noise in a way successfully calculates how to hide a single client's activity? It would be helpful to have a reference to work off of. Pages 7-8 of the PrivCount paper give the theory behind differential noise. I am not sure where to find anything similar in the tor code. When we add noise, we've done it inconsistently and arbitrarily in the past. Perhaps Rob or Aaron can help? -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22422#comment:7> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online _______________________________________________ tor-bugs mailing list tor-bugs@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-bugs