Cloud Database Encryption Keys and CMEK

In cloud security documentation, the phrase "We encrypt everything" often lacks depth, as it doesn't clarify who controls the encryption keys or the conditions under which data access can be revoked. For most enterprises, standard platform-managed encryption suffices, where data is encrypted at rest using cloud-managed KMS keys. However, for organizations with stringent data sovereignty, regulatory, or contractual obligations, Customer-Managed Encryption Keys (CMEK) are crucial. CMEK allows customers to control their encryption keys, ensuring data cannot be accessed without their explicit permission, as exemplified by SingleStore Helios. While this provides higher security assurance, it also carries the risk of permanent data loss if keys are mishandled. Therefore, a mature key management process is essential for deciding between platform-managed and customer-managed encryption, depending on specific security requirements and compliance needs.

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