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Tor is the most well-known tool for circumventing censorship. Unfortunately,Tor traffic has been shown to be detectable using deep-packet inspection.WebRTC is a popular web frame-work that enables browser-to-browser connections.Snowflake is a novel pluggable transport that leverages WebRTC to connect Torclients to the Tor network. In theory, Snowflake was created to beindistinguishable from other WebRTC services. In this paper, we evaluate theindistinguishability of Snowflake. We collect over 6,500 DTLS handshakes fromSnowflake, Facebook Messenger, Google Hangouts, and Discord WebRTC connectionsand show that Snowflake is identifiable among these applications with 100%accuracy. We show that several features, including the extensions offered andthe number of packets in the handshake, distinguish Snowflake among theseservices. Finally, we suggest recommendations for improving identificationresistance in Snowflake. We have made the dataset publicly available.

Evaluating Snowflake as an Indistinguishable Censorship Circumvention Tool