[TLS] Exposing and Circumventing China's Censorship of ESNI

We confirm that the Great Firewall (GFW) of China has recently begun blocking ESNI—one of the foundational features of TLS 1.3 and HTTPS. We empirically demonstrate what triggers this censorship and how long residual censorship lasts. We also present several evasion strategies discovered by Geneva that can be run either client-side or server-side to evade blocking.

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