[tor-bugs] #22422 [Core Tor/Tor]: Add noise to PaddingStatistics

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#22422: Add noise to PaddingStatistics
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 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:                |  Actual Points:
Parent ID:                |         Points:  0.5
 Reviewer:                |        Sponsor:
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Comment (by teor):

 We should try to add enough noise to hide a single client's activity over
 24 hours.

 How many padding cells do you expect for a single idle client per day?

 A recent measurement showed that ~20% of all entry connections are
 inactive, so we should try to hide at least an idle client's worth of
 activity:

     We found that Tor has about 700 thousand unique clients
     connecting to the network during an average 10-minute in-
     terval. Compared to Tor’s own estimate of about 1.75 million
     clients per day in May 2016 [4], this suggests that the client
     population turns over about 2.5 times a day.  Somewhat sur-
     prisingly, we found that about 130 thousand clients have in-
     active circuits during an average 10 minutes

 Source:
 Section 5.3, Page 11 in http://www.robgjansen.com/publications/privcount-
 ccs2016.pdf

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22422#comment:4>
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