Which type of encryption should be used?
Use server-side encryption with Amazon S3-managed keys.
Use server-side encryption with AWS KMS-managed keys.
Use client-side encryption with AWS KMS-managed keys.
Use server-side encryption with customer-provided keys.
Explanations:
Server-side encryption with Amazon S3-managed keys (SSE-S3) means that Amazon S3 manages the keys for you. This option does not allow for on-premises key management, as the keys are not accessible to the user.
Server-side encryption with AWS KMS-managed keys (SSE-KMS) uses AWS Key Management Service to manage the keys. While KMS offers a level of control, the keys are still managed by AWS, which does not align with the requirement of managing keys on-premises.
Client-side encryption with AWS KMS-managed keys means that data is encrypted before it reaches S3, and the keys are managed through AWS KMS. This does not meet the requirement of managing keys on-premises.
Server-side encryption with customer-provided keys (SSE-C) allows the user to manage encryption keys while Amazon S3 handles the encryption and decryption of the data. This option allows for on-premises key management, fulfilling the requirement.
I plot that the answer is:
Use server-side encryption with customer-provided keys.
As I recall, the answer is:
Use server-side encryption with customer-provided keys.