Azure Managed HSM vs OpenKCM (Open Key Chain Manager)

Azure Managed HSM is a cloud service for managing cryptographic keys backed by hardware security modules. It supports customer-managed keys, automatic key rotation, audit logs and key import through a web-accessed service. Both listed key types are supported. The Standard B1 plan is a Managed HSM pool billed by hourly usage fee per HSM pool; no price is provided. Azure lists no free plan. The cloud deployment model suits organisations that want managed HSM capabilities rather than a self-hosted installation. Key import allows existing keys to be brought into the service, while automatic rotation handles scheduled key changes. Audit logs provide activity records for review. Teams evaluating the service can focus on whether HSM-backed protection, customer control, import, rotation and logging meet their key-management needs, and whether hourly pool billing fits their usage.

OpenKCM (Open Key Chain Manager) is a free, open-source key management service for governing encryption keys and protecting data at rest. It supports BYOK key import and HYOK, which keeps master keys in a customer’s infrastructure. Its recursive L1–L4 hierarchy makes data keys dependent on higher-level keys. Governance and policy control are handled by CMK, while Krypton performs cryptographic execution; applications request key operations through the KMIP API.

The Gateway is designed to run near applications, such as in Kubernetes or a cloud VPC, and the same software can operate across AWS, Azure and on-premise environments. Customer root keys can remain in AWS, Azure or GCP key services, or on-premise HSMs, while OpenKCM holds a reference to the L1 key. A kill switch can halt downstream key use by removing that reference or revoking the root key. CMK connects to a corporate identity provider and sends audit logs to SIEM systems. The project’s CMK and Krypton components are actively being developed; encryption and decryption operations are in progress, while audit export, high availability and disaster recovery are planned for 2027.