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arxiv: 1907.07120 · v1 · pith:PZW4RW77new · submitted 2019-07-16 · 💻 cs.CY · cs.NI· cs.SI

Measuring I2P Censorship at a Global Scale

Nguyen Phong Hoang , Sadie Doreen , Michalis Polychronakis This is my paper

Pith reviewed 2026-05-24 20:31 UTC · model grok-4.3

classification 💻 cs.CY cs.NIcs.SI
keywords I2Pcensorship measurementVPN infrastructureanonymity networksglobal internet filteringdomain blockingpacket injection
0
0 comments X

The pith

Volunteer VPN servers enable global measurements that detect I2P blocking in China, Iran, Oman, Qatar, and Kuwait.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper introduces a measurement platform built from volunteer-run VPN servers to test censorship of the I2P anonymity network at scale. The setup supported 54K measurements from 1.7K locations in 164 countries over one month, checking access to the official homepage, mirror sites, reseed servers, and active relays. Detection methods identified domain blocking, packet injection, and block pages as the blocking techniques used. A reader would care because the work maps where users lose reliable access to tools built for private online communication.

Core claim

Using a network of distributed volunteer-operated VPN servers as vantage points, the authors conducted in-depth measurements of I2P service availability at a global scale. Over one month they performed 54K tests from 1.7K locations in 164 countries and identified I2P censorship in China, Iran, Oman, Qatar, and Kuwait through detection of domain name blocking, network packet injection, and block pages.

What carries the argument

The opportunistic censorship measurement infrastructure built on volunteer VPN servers, which supplies geographically diverse vantage points capable of multi-layer network analysis.

If this is right

  • I2P homepage, mirror, reseed servers, and relays face blocking via domain tampering, packet injection, or block pages in the five identified countries.
  • The VPN infrastructure supports both wide geographic coverage and deep inspection across network layers.
  • Detection techniques distinguish among multiple blocking methods at different protocol levels.
  • Observed patterns allow discussion of possible circumvention steps for affected users.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same volunteer-VPN approach could be reused to track blocking of other anonymity networks over time.
  • Users in the five countries may need additional steps, such as alternative entry points, to reach I2P services.
  • Periodic re-measurement from the same locations could reveal whether the blocking is stable or changes with policy shifts.

Load-bearing premise

The volunteer-operated VPN servers provide unbiased, uncensored vantage points that accurately reflect local network conditions without their own traffic being filtered or altered by the same mechanisms under study.

What would settle it

Independent tests from non-VPN sources inside China, Iran, Oman, Qatar, or Kuwait that show full, unblocked access to all four I2P services would falsify the reported censorship findings.

Figures

Figures reproduced from arXiv: 1907.07120 by Michalis Polychronakis, Nguyen Phong Hoang, Sadie Doreen.

Figure 1
Figure 1. Figure 1: I2P routing mechanism [48]. that run the I2P router software to communicate with each other. I2P messages are routed through two types of unidi￾rectional tunnels: inbound and outbound. In the example of [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Example block page from Kuwait [PITH_FULL_IMAGE:figures/full_fig_p011_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Example block page from Qatar [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Example block page from Oman. Country Domain-name-based blocking TCP packet injection Block page DNS SNI China geti2p.net reseed.i2p-projekt.de netdb.i2p2.no i2p.mooo.com N/A N/A N/A Iran N/A N/A i2p-projekt.de N/A Oman N/A geti2p.net geti2p.net i2p-projekt.de i2p-projekt.de Qatar N/A geti2p.net geti2p.net i2p-projekt.de i2p-projekt.de Kuwait N/A N/A i2p-projekt.de i2p-projekt.de [PITH_FULL_IMAGE:figures/… view at source ↗
read the original abstract

The prevalence of Internet censorship has prompted the creation of several measurement platforms for monitoring filtering activities. An important challenge faced by these platforms revolves around the trade-off between depth of measurement and breadth of coverage. In this paper, we present an opportunistic censorship measurement infrastructure built on top of a network of distributed VPN servers run by volunteers, which we used to measure the extent to which the I2P anonymity network is blocked around the world. This infrastructure provides us with not only numerous and geographically diverse vantage points, but also the ability to conduct in-depth measurements across all levels of the network stack. Using this infrastructure, we measured at a global scale the availability of four different I2P services: the official homepage, its mirror site, reseed servers, and active relays in the network. Within a period of one month, we conducted a total of 54K measurements from 1.7K network locations in 164 countries. With different techniques for detecting domain name blocking, network packet injection, and block pages, we discovered I2P censorship in five countries: China, Iran, Oman, Qatar, and Kuwait. Finally, we conclude by discussing potential approaches to circumvent censorship on I2P.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The paper presents an opportunistic censorship measurement infrastructure built on volunteer-operated VPN servers, enabling global-scale measurements of I2P service availability (official homepage, mirror, reseed servers, and active relays). It reports 54K measurements from 1.7K locations in 164 countries over one month, using techniques to detect domain name blocking, packet injection, and block pages, and claims to have discovered I2P censorship in China, Iran, Oman, Qatar, and Kuwait.

Significance. If the vantage-point methodology holds, the work offers valuable breadth (164 countries) and depth (full network stack) for studying censorship of anonymity networks, a topic of growing importance. The opportunistic volunteer-VPN approach is a strength for scale, and the discussion of circumvention strategies adds practical value. The scale of 54K measurements is a concrete asset for empirical censorship studies.

major comments (2)
  1. [Infrastructure and vantage points section] Infrastructure and vantage points section: The detections of I2P blocking in the five named countries rest on the assumption that the 1.7K volunteer VPN servers are faithful, unbiased proxies for native in-country network conditions. No details are given on validation steps such as IP geolocation confirmation, checks for VPN-provider filtering, or direct comparisons of tunneled vs. native paths; this is load-bearing for the country-specific claims and could produce artifacts if the measurement channel itself is altered.
  2. [Results section] Results section: The paper reports positive detections via domain blocking, packet injection, and block-page techniques but provides no quantitative error rates, false-positive estimates, or cross-validation of these detectors. Without such metrics, the reliability of the five-country findings cannot be assessed at the level required to support the central empirical claim.
minor comments (1)
  1. [Abstract] The abstract states measurements occurred 'within a period of one month' but does not give the exact dates; adding this would improve reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback on our manuscript. The comments highlight important aspects of our methodology and results that warrant clarification and expansion. We address each major comment below and will revise the paper to improve transparency regarding our vantage points and detection methods.

read point-by-point responses

  1. Referee: [Infrastructure and vantage points section] Infrastructure and vantage points section: The detections of I2P blocking in the five named countries rest on the assumption that the 1.7K volunteer VPN servers are faithful, unbiased proxies for native in-country network conditions. No details are given on validation steps such as IP geolocation confirmation, checks for VPN-provider filtering, or direct comparisons of tunneled vs. native paths; this is load-bearing for the country-specific claims and could produce artifacts if the measurement channel itself is altered.

    Authors: We agree that additional details on vantage point validation would strengthen the paper. The volunteer-operated VPN servers provided the scale necessary for global coverage, but this also constrained our ability to perform exhaustive native-path comparisons or provider-specific filtering audits in all cases. In the revised version, we will expand the Infrastructure and vantage points section with a new subsection describing the selection criteria for the servers, any geolocation consistency checks performed, and an explicit discussion of the assumptions and potential limitations of the proxy-based approach. We will also note that while we cannot retroactively add direct native comparisons, the multi-technique detection strategy (domain blocking, packet injection, and block pages) provides some internal corroboration. revision: partial

  2. Referee: [Results section] Results section: The paper reports positive detections via domain blocking, packet injection, and block-page techniques but provides no quantitative error rates, false-positive estimates, or cross-validation of these detectors. Without such metrics, the reliability of the five-country findings cannot be assessed at the level required to support the central empirical claim.

    Authors: We acknowledge that quantitative error metrics would allow readers to better assess the reliability of the five-country detections. Although ground-truth data for censorship events is inherently difficult to obtain at this scale, preventing formal false-positive rate calculations, we will add a subsection to the Results section that discusses potential error sources for each detection technique and describes the manual verification steps applied to block-page detections. We will also include a limitations paragraph noting the absence of cross-validation against independent datasets and the implications for the reported findings. revision: yes

Circularity Check

0 steps flagged

No circularity: empirical measurement study with direct observations only

full rationale

The paper reports results from 54K direct measurements of I2P service availability using volunteer VPN vantage points across 164 countries. No mathematical derivations, equations, fitted parameters, predictions, or ansatzes appear in the abstract or described methodology. Claims of censorship in five countries are presented as observational outcomes, not reductions from prior self-citations or self-definitions. The study is self-contained as an empirical report against external network conditions; no load-bearing step reduces to its own inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the assumption that the volunteer VPN network supplies reliable, diverse vantage points. No free parameters or invented entities are introduced; the work is purely observational.

axioms (1)
  • domain assumption Volunteer-run VPN servers provide geographically diverse and unbiased vantage points for detecting local censorship.
    The infrastructure is explicitly built on top of these servers to achieve breadth of coverage.

pith-pipeline@v0.9.0 · 5748 in / 1075 out tokens · 17608 ms · 2026-05-24T20:31:57.200587+00:00 · methodology

discussion (0)

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