What kind of encryption ensures data is secure before it reaches AWS storage services?

Client-side encryption is the method used to secure data before it is transmitted to AWS storage services. This approach ensures that data is encrypted on the client side—meaning it is encrypted on the user's device or application before being sent to AWS. With client-side encryption, the user retains control over the encryption keys, which adds an extra layer of security since only the user can decrypt the data once it has been securely stored.

In contrast, server-side encryption occurs after the data reaches AWS, where AWS encrypts the data before storing it in the cloud. This means the data is not encrypted until it arrives at the storage service, which does not meet the requirement of ensuring data security before it hits the cloud. End-to-end encryption encompasses the entire path of the data but does not specifically indicate control of encryption on the client side. Field-level encryption involves encrypting individual fields in a data structure and is typically used for securing sensitive data within a broader data set rather than completely securing data before it is sent to a storage service.

Thus, client-side encryption is the correct choice for ensuring that data is encrypted prior to reaching AWS storage services, maintaining user control over the encryption process and securing sensitive information throughout the transfer.