Even Censors Have a Backup: Examining China's Double HTTPS Censorship Middleboxes
Even Censors Have a Backup: Examining China's Double HTTPS Censorship Middleboxes
复制标题
即使是审查机构也有备份:检查中国的双重 HTTPS 审查中间盒
DOI:
10.1145/3473604.3474559
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Levin, Dave
中科院分区:
文献类型:
--
作者:
Bock, Kevin;Naval, Gabriel;Reese, Kyle;Levin, Dave
The Great Firewall of China (GFW) has long censored HTTPS (via the Server Name Indication field, or SNI). Its mechanism for doing so has been studied, with various evasion strategies discovered in recent years. In this paper, we have evidence that suggests the GFW has deployed a second HTTPS censorship middlebox that runs in parallel to the first. We present a detailed analysis of this secondary censorship middlebox---how it operates, the content it blocks, and how it interacts with the primary middlebox---and present evidence that this has been in operation since at least September 2019. We also present several packet-based evasion strategies for the secondary middlebox and demonstrate that the primary censorship middlebox can be defeated independently from the secondary. Our code is publicly available.
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