"Additionally, with the ECH extension not yet being widely used [17], [71] and focusing on privacy protection rather than censorship circumvention [60], it can be censored easily by blocking it entirely [14], [76]."
The paper describes various GFW bypass methods that currently work, including removing the SNI extension entirely
It does not mention anyone using ECH to bypass GFW
Perhaps it is too early to conclude "China blocks ECH" because ECH is not in widespread use
Any examples of Cloudflare client websites that have enabled ECH
China blocks ECH.
do you have a reliable source for this claim?
China's use of SNI-based censorship is well-documented
For example, see
https://censorbib.nymity.ch/pdf/Niere2025a.pdf
China has blocked ESNI
https://gfw.report/blog/gfw_esni_blocking/en/
But SNI is not CH and ESNI is not ECH
Will China block ECH
ECH blocking has been detected in Russia
https://github.com/net4people/bbs/issues/417
According to Niere et al. (2025)
"Additionally, with the ECH extension not yet being widely used [17], [71] and focusing on privacy protection rather than censorship circumvention [60], it can be censored easily by blocking it entirely [14], [76]."
The paper describes various GFW bypass methods that currently work, including removing the SNI extension entirely
It does not mention anyone using ECH to bypass GFW
Perhaps it is too early to conclude "China blocks ECH" because ECH is not in widespread use
Yes, but SNI is not ECH.