The Cloud Security Alliance (CSA) released Cloud Key Management System with External Origin Key.
Written by the Cloud Key Management Working Group to help organizations optimize such business outcomes as security, agility, cost, and compliance, the paper provides general guidance for choosing, planning, and deploying cloud-native key management systems (KMS) in cases where organizations either want to or must import key material (e.g., keys, vaults, secrets, policies) from an external source.
“A cloud service provider’s KMS often has strong ties to its other cloud services, and this same cloud-native KMS using EKO can be used with a customer’s on-premises technologies and cloud services from other providers. Unsurprisingly, integrating a cloud KMS with an organization’s assets spanning traditional private data centers, as well as private and public cloud services in various geographic locations presents a host of challenges,” said Paul Rich, co-chair of the Cloud Key Management Working Group and one of the paper’s authors. “It’s our hope that after reading this document, program and project managers who have been tasked with leading their organization through the selection, planning, and deployment stages of cloud-native KMS using EKO will be able map considerations to their organization.”
The guidance addresses the technical, operational, legal, regulatory, and financial aspects of leveraging a cloud-native KMS using external key origin (EKO) for each of the three stages of the lifecycle (choosing, planning, and deploying). Each aspect is broken down into further considerations and their accompanying justifications.
Because cloud-native key management systems using EKO are relatively new, there isn’t a large repository of best practices from which to draw. This guidance, therefore, combines best practices drawn from experience with traditional key management systems, cloud services in general, and cloud-native key management systems.
For further reading, Key Management in Cloud Services: Understanding Encryption’s Desired Outcomes and Limitations provides the foundation for the choice of cloud KMS pattern and general guidance for using KMS whether the KMS is native to a cloud platform, external, self-operated, or yet another cloud service. Additionally, Recommendations for Adopting a Cloud-Native Key Management System provides more specific guidance for choosing, planning, and deploying cloud-native key management systems.
The Cloud Key Management Working Group aims to facilitate the standards for seamless integration between cloud service providers and key broker services.