Worked on the wolfSSL/wolfssl repository to enhance the robustness and security of the TLS handshake, specifically focusing on the Encrypted Client Hello (ECH) flow. Addressed a critical bug by refining hash calculations, adding input validation, and implementing null-pointer safeguards to ensure correct and secure handshake operations. Leveraged C programming and cryptography expertise to improve ECH acceptance logic and protect against uninitialized variables, thereby reducing the risk of runtime errors. Prioritized stability and secure defaults while maintaining performance and compatibility for ECH-enabled connections. The work demonstrated a methodical approach to strengthening network security and reliability in TLS implementations.