What is not supported by AWS RDS regarding encryption?

AWS RDS (Relational Database Service) provides robust support for encryption features to help secure your data. Among the choices given, customer-imported encryption keys are not supported by AWS RDS.

AWS RDS utilizes AWS Key Management Service (KMS) for managing and controlling encryption keys. With KMS, users can rely on AWS-managed keys or, in most cases, KMS-managed keys for their encryption needs. This allows RDS to handle encryption at rest seamlessly, ensuring that your data is secured while stored on disk. Additionally, RDS integrates well with IAM (Identity and Access Management) policies, allowing for fine-grained control over who can access or manage the database and its encryption settings.

While customers can have significant control over the encryption process using KMS-managed keys, the option to import custom encryption keys does not exist in RDS. This limitation helps to maintain the security and integrity of the databases by standardizing the key management process and preventing potential vulnerabilities that could arise from user-managed keys.

Understanding this aspect of AWS RDS encryption is vital for appropriately securing your databases while leveraging AWS's managed services and ensuring compliance with various security standards.