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Understanding UDP Hysteria: A High-Speed, Secure, and Censorship-Resistant Proxy Protocol

Hysteria is an advanced TCP and UDP proxy protocol built on top of the QUIC transport protocol, designed to provide high-speed, secure, and censorship-resistant internet connectivity. With its unique features, Hysteria ensures enhanced performance and privacy by leveraging QUIC’s capabilities, especially starting from version 2.0.0. It uses multibyte numbers and variable-length integers for data encoding and ensures traffic obfuscation through HTTP/3 masquerading, making encrypted traffic indistinguishable from standard HTTP/3 traffic. Clients authenticate with specific HTTP/3 headers, and upon success, the server relays data over QUIC’s unreliable datagram channel for both TCP and UDP connections. Hysteria employs congestion control algorithms and supports fragmentation for large UDP packets. Additionally, it integrates the “Salamander” obfuscation layer, enhancing security by masking packet payloads. These features, combined with robust proxying and flexible server behavior, make Hysteria an efficient and secure solution for bypassing censorship and ensuring privacy while maintaining high-speed connectivity.