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Re: [tor-bugs] #28555 [Metrics/Analysis]: Assess methodology for modern privcount Tor user counts
#28555: Assess methodology for modern privcount Tor user counts
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Reporter: arma | Owner: metrics-team
Type: task | Status: new
Priority: Medium | Milestone:
Component: Metrics/Analysis | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor: Sponsor19
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Comment (by teor):
I just wrote about this in #tor-project:
The 8 million user figure was measured using PSC, which does unique counts
across multiple relays. We won't be implementing unique counts in
PrivCount in Tor, because it's an entirely different protocol, which takes
~24 hours to aggregate the counts.
Pages 8-11 of https://export.arxiv.org/pdf/1809.08481 give a few more
details about the methods we used to calculate the 8 million figure.
The best way to get a better estimate out of metrics, is to measure how
many consensuses a client downloads in 24 hours, and update metrics'
estimate. (We can't really do anything to measure clients that move IP
addresses, or clients that are only online for part of a day.)
Maybe we could measure the average number of consensuses per day per IP
address using PrivCount? But then we'd be keeping sensitive info in RAM
(IP addresses).
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28555#comment:3>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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