There two stage about data protection. These stages are transit (as it travels to and from Amazon S3) and storage(while it is stored on Amazon S3 infrastructure). As a best practice, all sensitive data stored in Amazon S3 should be encrypted, both at storage and in transit.

For protecting the data in transit, developers can use Amazon S3 SSL API endpoints. For data stored on Amazon S3 infrastructure, developers can encrypt it using different options of Server-Side Encryption (SSE).

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