The key policy will allow access from all IAM entities in your AWS account (as long as the IAM policy allows it). To create a basic CMK, run: aws kms create- key
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You also have full control over the CMK by customizing the key policy. At any time, you can delete the CMK to make all data useless. You create a Customer Master Key (CMK) and reference that key for encryption/decryption. You can not delete or restrict the AWS managed CMK used by S3! SSE-KMS (customer managed CMK)Īlternatively, you can manage the secret key (aka Customer managed Customer Master Key) using the KMS service. "Sid": "Allow direct access to key metadata to the account", "Sid": "Allow access through S3 for all principals in the account that are authorized to use S3",
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To download the decrypted file, run: aws s3 cp s3:// bucket-name/sse-kms path/to/local.file To upload a file and store it encrypted, run: aws s3 cp path/to/local.file s3:// bucket-name/sse-kms -sse aws:kms The only difference is that the secret key (aka AWS managed Customer Master Key (CMK)) is provided by the KMS service and not by S3. To download the decrypted file, run: aws s3 cp s3:// bucket-name/sse-aes path/to/local.file To upload a file and store it encrypted, run: aws s3 cp path/to/local.file s3:// bucket-name/sse-aes -sse AES256 AWS also controls the secret key that is used for encryption/decryption.
AWS handles encryption and decryption for you on the server-side using the aes256 algorithm. The en/decryption is transparent to the AWS user. When you retrieve data, AWS reads the encrypted data from the disk, decrypts the data, and sends raw data back to you. On the AWS infrastructure, the raw data is encrypted and finally stored on disk. Server-side encryption means that you send unencrypted raw data to AWS. Let’s dive into the details of each option. The following table summaries the available options on S3 to encrypt your data at rest. Managing access to the secret is a great responsibility. Who manages the secret? Data encryption makes no sense if everyone can access your secret.You are no longer able to decrypt your pictures. The loss of the USB stick is a catastrophe.
Unfortunately, the USB stick where your stored the secret broke. A few months later, you want to look at your pictures. You store the secret used for encryption on your USB stick. Who stores the secret? Imagine you encrypted all your pictures and uploaded them to S3.Server-side encryption is different because you send the raw data to S3 where it is encrypted. When you encrypt data on your side, the data transferred to S3 is already encrypted. Who en/decrypts the data? Data encryption can happen either on your side (client-side encryption) or on AWS (server-side encryption or SSE).The fundamental questions to compare the options are: S3 offers a bunch of options to encrypt your data at rest.
This blog post will guide you through all ways to encrypt your S3 data at rest. If you transfer data to S3, it is TLS encrypted by default. If the data is on the network, it is in transit. Before we dive into encrypting data at rest, I want to highlight that there is also data in use and data in transit. Data at rest means inactive data stored physically on disk. S3 comes with a bunch of features to encrypt your data at rest.