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Old 14th February 2019
e1-531g e1-531g is offline
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Default South Korea is Censoring the Internet by Snooping on SNI Traffic

South Korea has been blocking HTTP websites that are on their censor list for a while now and they have recently started using SNI filtering to block their counterparts served over HTTPS.

A warning page bearing the seals of the Korea Communications Standards Commission (KCSC) and the Korean National Police Agency is displayed for blocked HTTP websites, while TLS sites blocked using Server Name Indication (SNI) filtering will only throw a "This site can't be reached" error.
Originally Posted by Nick Sullivan
And it looks like they're blocking encrypted SNI outright (according to accounts on the ground).
Originally Posted by Leonid Evdokimov
It's kinda interesting that ESNI is blocked (according to your text), while SNI split across several TCP segments passes through (according to GoodbyeDPI users reporting that to @ValdikSS) and lack of SNI passes through as well (thanks RIPE Atlas). Seems, ESNI is _targeted_.
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censorship, esni, sni, tls

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