Which encryption method is managed by S3 and ensures data is encrypted before saving to disk?

Server-Side Encryption (SSE) is the correct answer because it is an encryption method that Amazon S3 manages to automatically encrypt your data before it is saved to disk. With SSE, data is encrypted at rest using one of the specified encryption methods (SSE-S3, SSE-KMS, or SSE-C). This means that when you upload your data to an S3 bucket, it is encrypted server-side before the storage process, ensuring that sensitive information is protected without any action required from the user.

SSE simplifies the encryption process as users do not need to manage their own encryption keys or worry about the details of encryption algorithms. Instead, S3 handles this seamlessly, providing a layer of security for stored objects. It supports compliance and regulatory standards for data protection while allowing users to focus on data usage rather than data protection logistics.

In contrast, client-side encryption involves encrypting data before it is sent to S3, meaning users must manage encryption keys and the encryption process themselves, which adds complexity. Public Key Infrastructure (PKI) is a framework to manage digital certificates and encryption keys but isn't a specific method for encrypting data stored in S3. Encryption at Rest is a broader term that generally refers to physical storage encryption but does not