Bypassing Mobile Firewall on Domain Blocking
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Simply put, the domain's port 443 is blocked, and SSL cannot access the website content. More complexly, TLS is the security foundation for network communications (HTTPS). TLS provides authentication and encryption that allows users to confirm who they are communicating with and ensures that communication information is not seen or tampered with by intermediaries. Although TLS can hide the *content* of user communications, it does not always hide the *object* of user communications. For example, the TLS handshake can carry an extension called Encrypted Server Name Indication (SNI), which helps the client tell the server the domain name of the website it wants to access. Censors, including those in China, use this extension to check and block users from accessing specific websites.
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