[tor-bugs] #20495 [Metrics/Censorship analysis]: China blocking of meek, 2016-10-19

Tor Bug Tracker & Wiki blackhole at torproject.org
Fri Oct 28 22:38:30 UTC 2016

#20495: China blocking of meek, 2016-10-19
 Reporter:  dcf                          |          Owner:
     Type:  task                         |         Status:  new
 Priority:  Medium                       |      Milestone:
Component:  Metrics/Censorship analysis  |        Version:
 Severity:  Normal                       |     Resolution:
 Keywords:  censorship block cn meek     |  Actual Points:
Parent ID:                               |         Points:
 Reviewer:                               |        Sponsor:

Comment (by dcf):

 Some other countries show a decrease on or about the same time, though not
 to the same relative extent: us, ru, de, gb. (Notably absent is
 combined.html?start=2016-09-01&end=2016-10-28&country=br br], which is way
 off the chart at the top.)

 One possibility is that this is another case of some botnet or other
 widespread software that used meek but then suddenly stopped. Perhaps
 China was simply more affected than other countries.



 # https://metrics.torproject.org/userstats-combined-data.html
 x <- read.csv("userstats-combined.csv")
 x$date <- as.Date(x$date)
 x$avg <- ave((x$low + x$high)/2, x$country)

 p <- ggplot(x[x$node=="bridge" & x$transport=="meek" & x$avg>=50, ],
 aes(x=date, y=(high+low)/2, ymax=high, ymin=low, color=country,
 p <- p + geom_ribbon(alpha=0.5)
 p <- p + geom_text(aes(label=country))
 p <- p + theme(legend.position="none")
 p <- p + coord_cartesian(xlim=c(as.Date("2016-09-01"),
 as.Date("2016-10-28")), ylim=c(0, 1500))
 p <- p + scale_x_date(date_breaks="1 month", date_minor_breaks="1 week")
 ggsave("meek-by-country.png", p, width=10, height=5, dpi=90)

Ticket URL: <https://troodi.torproject.org/projects/tor/ticket/20495#comment:5>
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