Antoine Bigard focused on security hardening for the mission-apprentissage/flux-retour-cfas repository, delivering a feature that enhanced the Vault password retrieval script. He updated the script to use a revised operation document get command and refreshed the vault file content to align with a new encryption key and configuration. Working primarily with Shell scripting and leveraging DevOps and security best practices, Antoine improved the reliability and auditability of secret management within deployment pipelines. Although the work was limited in scope to a single feature over one month, it addressed key aspects of secure key rotation and maintenance without introducing new bug fixes.