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How we can protect data in s3

We can protect the data in s3 in two ways.

1. Protecting Data Using Server-Side Encryption

In this case customer requests Amazon S3 to encrypt your object before saving it on disks in its data centers and decrypt it   when you download the objects.

How? 

Reference: https://docs.aws.amazon.com/AmazonS3/latest/dev/serv-side-encryption.html



  • Use Server-Side Encryption with Amazon S3-Managed Keys (SSE-S3) – Each object is encrypted with a unique key employing strong multi-factor encryption. As an additional safeguard, it encrypts the key itself with a master key that it regularly rotates. Amazon S3 server-side encryption uses one of the strongest block ciphers available, 256-bit Advanced Encryption Standard (AES-256), to encrypt your data.

    Reference:  Protecting Data Using Server-Side Encryption with Amazon S3-Managed Encryption Keys (SSE-S3).
  • Use Server-Side Encryption with AWS KMS-Managed Keys (SSE-KMS) – Similar to SSE-S3, but with some additional benefits along with some additional charges for using this service. There are separate permissions for the use of an envelope key (that is, a key that protects your data's encryption key) that provides added protection against unauthorized access of your objects in S3. SSE-KMS also provides you with an audit trail of when your key was used and by whom. Additionally, you have the option to create and manage encryption keys yourself, or use a default key that is unique to you, the service you're using, and the region you're working in.

    Reference: Protecting Data Using Server-Side Encryption with AWS KMS–Managed Keys (SSE-KMS).
  • Use Server-Side Encryption with Customer-Provided Keys (SSE-C) – You manage encryption/decryption of your data, the encryption keys, and related tools.

    Reference: Protecting Data Using Server-Side Encryption with Customer-Provided Encryption Keys (SSE-C).


2. Protecting Data Using Client-Side Encryption

In this case customer can encrypt data client-side and upload the encrypted data to Amazon S3. In this case, you manage the encryption process, the encryption keys, and related tools.

How? 

Option 1: Using an AWS KMS–Managed Customer Master Key (CMK)

Option 2: Using a Client-Side Master Key

Reference: https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingClientSideEncryption.html


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