Azure Key Vault

Azure Key Vault is a cloud service for securely storing and accessing secrets. A secret is anything you want to tightly control access to, such as API keys, passwords, certificates, or cryptographic keys. Key Vault service supports two types of containers: vaults and managed hardware security module(HSM) pools. Vaults support storing software and HSM-backed keys, secrets, and certificates. Managed HSM pools only support HSM-backed keys. See Azure Key Vault REST API overview for complete details.