Overview of Statistical Data in the Tor Network

Statistical analysis in the Tor network can be performed using various kinds of data. In this report we give an overview of three major data sources for statistics in the Tor network: First, we recap measuring the Tor network from public directory information [4] in Section 2 and explain the sanitzation process of (non-public) bridge directory information in Section 3. Second, we describe the numerous aggregate statistics that relays publish about their usage [5] in Sections 4 to 8. Third, we delineate the output of various Tor services like BridgeDB, GetTor, or Tor Check as well as specific measurement tools like Torperf in Sections 11 to 14. All data described in this report are available for download on the metrics website.1