Worked on the fortanix/rust-sgx repository to enhance the reliability and security of Intel SGX provisioning. Focused on modifying the provisioning client to prioritize the latest platform certificate (pckcert) during fallback PCK certificate requests, ensuring that the most recent Trusted Computing Base (TCB) information is always used. This targeted update reduced the risk of provisioning with outdated certificates and improved the overall security posture of the system. The work was implemented in Rust, leveraging expertise in cryptography and system programming. The changes were carefully scoped to minimize impact, resulting in a robust feature addition without introducing new bugs or regressions.