Sepior Key-Management-as-a-Service (KMaaS) is a key management system delivered as a service. KMaaS is based on threshold cryptography which is a way to do key management using the state-of-the-art cryptographic technique called Multi-Party Computation (MPC).

KMaaS consists of a number of different artefacts:

• A Threshold Security Module (TSM) which is effectively a cluster of so-called MPC nodes
• An administration tool delivered as a browser-based application
• Integration with applications needing to do cryptographic operations through a number of SDKs and plugins
• An audit log service

We present these artefacts here, and also provide background information on MPC, formal proofs, and third-party attestations