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.
Ahead of its February 21st elections and amidst the chaos of COVID-19, Iran quietly deployed a second censorship system: a protocol whitelister. Click read more to learn about how the protocol whitelister works and how we can circumvent it.