Worked on hardening TLS cipher-suite parsing in the openssl/openssl repository to improve the stability and correctness of cipher selection. Addressed undefined behavior in the ciphersuite_cb() function by guarding against NULL elements returned from CONF_parse_list, which previously could cause crashes when parsing empty tokens. Added regression tests to cover edge cases involving leading, trailing, and consecutive separators, ensuring valid ciphersuites are consistently applied. The work demonstrated strong C programming and defensive coding practices, with a focus on memory safety and test-driven development. Collaborated through code review, resulting in merged changes that enhance runtime reliability for TLS handshakes.