Shadowsockets Reduecd IV Head Entropy Experiment#1552
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xiaokangwang merged 7 commits intomasterfrom Jan 15, 2022
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- Coverage 39.32% 39.31% -0.02%
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This is a pull request for the experiment on GFWReport's proposal for a countermeasure for the random stream like protocol blocking behaviour observed on GFW.
According to the gfw.report et al's research, when connecting to the impacted VPSs, GFW is likely to block binary protocols unless it is an HTTP, TLS, or SSH connection, or the first 6 bytes of data sent from client to server can be interpreted as printable characters. This suggests in addition to TLS encryption, HTTP Header, this kind of censorship can also be temporarily evaded by only sending printable characters in the first 6 bytes of data.
This pull request adds "experimentReducedIvHeadEntropy" option to shadowsocks outbound. This option request V2Ray to remap the first 6 bytes of IV to printable characters.
Enabling experiments have security implications. It is possible for anyone on the privileged network path to identify the protocol when this experiment is enabled.