How Telegram Proxies Use Obfuscation and Fake TLS to Evade State Censorship

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Deep Packet Inspection (DPI) systems used by countries like Russia and Iran block Telegram by detecting the distinctive byte signatures of its MTProto transport protocol. To counter this, MTProto proxies employ three layered techniques: XOR obfuscation, random padding, and FakeTLS. XOR obfuscation replaces recognisable magic bytes with random data, while random padding alters packet sizes to prevent statistical fingerprinting by DPI systems. FakeTLS goes furthest by wrapping the entire proxy connection in a legitimate-looking TLS handshake, complete with a real server certificate and standard cipher suites, making the traffic indistinguishable from normal HTTPS browsing. Together, these layers ensure that state-level filters see only encrypted TLS records rather than any Telegram-specific patterns.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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