China’s Great Firewall is often spoken about but is rarely understood. It is one of the most sophisticated and opaque censorship systems on the planet, and it shapes how over a billion people interact with the global internet, influences the design of privacy and proxy tools worldwide, and continues to evolve in ways that challenge researchers, developers, and policymakers alike.

Jackson Sippe is a PhD researcher at the University of Colorado Boulder whose work focuses on uncovering how national-scale censorship systems operate. Jackson recently helped lead a groundbreaking study analyzing a previously undocumented GFW technique that quietly broke fully encrypted proxy protocols across China for more than a year.

In this episode, Jackson joins Gregor Vand to discuss how the Great Firewall works at a technical level, the 2021–2023 blocking event, the popcount-based detection algorithm his team reverse-engineered, the cat-and-mouse ecosystem of censorship circumvention, and what these findings mean for the future of the open internet.

Gregor Vand is a security-focused technologist, having previously been a CTO across cybersecurity, cyber insurance and general software engineering companies. He is based in Singapore and can be found via his profile at vand.hk or on LinkedIn.

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