A major upgrade to the Great Firewall added deep packet inspection for QUIC traffic, but new research shows this makes the system slower, easier to bypass, and vulnerable to abuse. For years, the Great Firewall of China (GFW) has been the most powerful censorship machine on the planet. A Tool That Can Be Turned AroundThe most surprising part of the study is that this censorship system can be hijacked. Exposing and Circumventing SNI-based QUIC Censorship of the Great Firewall of China research paperEach tweak makes life harder for the GFW. Source: Exposing and Circumventing SNI-based QUIC Censorship of the Great Firewall of China research paperThey avoided tipping off the firewall operators about less damaging flaws, especially ones that only affect the censorship tools themselves.