![]() This indicates that Iranian ISPs may have shifted their practices from applying “smart filters” (only censoring specific web pages) to “blanket censorship” (censoring entire services).Ĭensorship in Iran is not limited to websites. Today, we primarily see blocking of domains, including HTTPS access, since it’s not possible for the censor to tailor censorship to specific content of encrypted sites. In the past, when sites like Instagram did not support HTTPS, it was reported that Iranian ISPs would selectively censor content, rather than block access to entire domains. We find that Iran regularly blocks both encrypted (HTTPS) and unencrypted (HTTP) access to sites, making censorship circumvention harder. ![]() Most ISPs not only blocked the same sites, but they also used a standardized set of censorship techniques, suggesting a centralized censorship apparatus. ISPs were found to serve block pages through DNS injection and through the use of HTTP transparent proxies. Internet censorship in Iran is quite sophisticated. The full list of observed blocked domains is available here.
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