Answer: Use AWS KMS with automatic key rotation

Use AWS KMS with automatic key rotation - Server-side encryption is the encryption of data at its destination by the application or service that receives it. Amazon S3 encrypts your data at the object level as it writes it to disks in its data centers and decrypts it for you when you access it. You have three mutually exclusive options, depending on how you choose to manage the encryption keys: Server-Side Encryption with Amazon S3-Managed Keys (SSE-S3), Server-Side Encryption with Customer Master Keys (CMKs) Stored in AWS Key Management Service (SSE-KMS), Server-Side Encryption with Customer-Provided Keys (SSE-C). When you use server-side encryption with AWS KMS (SSE-KMS), you can use the default AWS managed CMK, or you can specify a customer managed CMK that you have already created. If you don't specify a customer managed CMK, Amazon S3 automatically creates an AWS managed CMK in your AWS account the first time that you add an object encrypted with SSE-KMS to a bucket. By default, Amazon S3 uses this CMK for SSE-KMS. You can choose to have AWS KMS automatically rotate CMKs every year, provided that those keys were generated within AWS KMS HSMs. Incorrect options: Encrypt the data before sending it to Amazon S3 - The act of encrypting data before sending it to Amazon S3 is called Client-Side encryption. You will have to handle the key generation, maintenance and rotation process. Hence, this is not the right choice here. Import a custom key into AWS KMS and automate the key rotation on an annual basis by using a Lambda function - When you import a custom key, you are responsible for maintaining a copy of your imported keys in your key management infrastructure so that you can re-import them at any time. Also, automatic key rotation is not supported for imported keys. Using Lambda functions to rotate keys is a possible solution, but not an optimal one for the current use case. Use SSE-C with automatic key rotation on an annual basis - With Server-Side Encryption with Customer-Provided Keys (SSE-C), you manage the encryption keys and Amazon S3 manages the encryption, as it writes to disks, and decryption, when you access your objects. The keys are not stored anywhere in Amazon S3. There is no automatic key rotation facility for this option.

Author: LeetQuiz Editorial Team