What is the MOST likely cause of this error?
The security engineer’s IAM user does not have encrypt and decrypt permissions for the new KMS key.
The security engineer’s IAM user does not have administrative permissions for the new KMS key.
The S3 bucket policy needs modification to allow users to access objects that are encrypted with the new KMS key.
The S3 bucket policy needs modification to allow the security engineer’s IAM user to access objects in the S3 bucket.
Explanations:
The error is most likely due to the security engineer’s IAM user not having the appropriate permissions to decrypt objects encrypted with the new KMS key. AWS KMS permissions (such askms:Decrypt) are required to retrieve the encrypted objects from S3.
Administrative permissions for the KMS key are not required to decrypt or access the objects, but rather specific decrypt permissions for the key associated with the S3 bucket are necessary.
The issue is not related to the S3 bucket policy but to the permissions on the KMS key. S3 bucket policies are generally used to control access to the S3 objects, but this issue is caused by a lack of KMS decryption permissions.
The S3 bucket policy typically governs access to the objects, but in this case, the issue is related to KMS permissions, not the S3 bucket policy. The IAM user needs the correct permissions for the KMS key rather than the bucket policy modification.