Hello,

We published a report documenting the *blocking of Tor in Russia*.

Read the report here: https://ooni.org/post/2021-russia-blocks-tor/

Our report shares OONI data and analysis on the blocking of the Tor network and Tor Project website on some AS networks in Russia.

*# Blocking of Tor*

On 1st December 2021, some ISPs in Russia started blocking access to the Tor network by means of IP blocking.

Out of (more than) 65 tested AS networks, OONI data only shows signs of Tor blocking on 15 AS networks in Russia.

Russia also blocks obfs4 addresses, which means that Tor users in Russia may need to use private Tor bridges to circumvent the block: https://forum.torproject.net/t/tor-blocked-in-russia-how-to-circumvent-censo...

Tor blocking differs from ISP to ISP in Russia. However, not all users on the same AS network experience Tor blocking.

*# Blocking of torproject.org http://torproject.org*

OONI data suggests that some ISPs in Russia have been blocking access to torproject.org since September 2021.

Censorship techniques across ISPs differ. On some networks, a block page is served for torproject.org, enabling us to automatically confirm the block.

On other networks, OONI data suggests that access to torproject.org is being interfered with by means of a TLS man-in-the-middle attack.

In other cases, we observe that the connection is reset once the TLS handshake has been initiated, suggesting the use of DPI.

Despite these blocks, OONI data suggests that both the Tor network & torproject.org are still accessible on most networks in Russia.

*# What you can do *

To help more Russians stay connected to the Tor network, please run a Tor bridge: https://forum.torproject.net/t/help-censored-users-run-a-tor-bridge/704

To circumvent Tor blocking in Russia, you can use a private Tor bridge: https://forum.torproject.net/t/tor-blocked-in-russia-how-to-circumvent-censo...

We also recommend keeping an eye out for (and updating to) the next Tor Browser version, and configuring Tor Browser to use Snowflake.

If access to torproject.org is blocked on your network, you can:

* Circumvent this block by visiting the Tor Project’s website mirror: https://tor.eff.org * Get Tor Browser by sending an email to gettor@torproject.org

We thank OONI Probe users in Russia who contributed measurements, supporting this study. <3

We also thank the Tor Project for their tireless efforts in building an online world that defends human rights. <3

Best,

OONI team.