In an era marked by the proliferation of edge computing, where devices and services extend beyond centralized data centers, security becomes paramount. As we push computation closer to the data source, we introduce a unique set of security challenges. How can we ensure the identity and authenticity of devices and services operating at the edge? How can we maintain data integrity and confidentiality in a distributed environment? These questions drive us to explore innovative solutions, and one such solution is HashiCorp Vault, a secret management tool with its powerful PKI (Public Key Infrastructure) engine.