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At AWS, safety is job zero. Starting immediately, Amazon Simple Storage Service (Amazon S3) encrypts all new objects by default. Now, S3 mechanically applies server-side encryption (SSE-S3) for every new object, until you specify a distinct encryption choice. SSE-S3 was first launched in 2011. As Jeff wrote on the time: “Amazon S3 server-side encryption handles all encryption, decryption, and key management in a totally transparent fashion. When you PUT an object, we generate a unique key, encrypt your data with the key, and then encrypt the key with a [root] key.”
This change places one other safety finest follow into impact mechanically—with no affect on efficiency and no motion required in your aspect. S3 buckets that don’t use default encryption will now mechanically apply SSE-S3 because the default setting. Existing buckets presently utilizing S3 default encryption won’t change.
As all the time, you possibly can select to encrypt your objects utilizing one of many three encryption choices we offer: S3 default encryption (SSE-S3, the brand new default), customer-provided encryption keys (SSE-C), or AWS Key Management Service keys (SSE-KMS). To have an extra layer of encryption, you may additionally encrypt objects on the shopper aspect, utilizing shopper libraries such because the Amazon S3 encryption shopper.
While it was easy to allow, the opt-in nature of SSE-S3 meant that you just had to make sure that it was all the time configured on new buckets and confirm that it remained configured correctly over time. For organizations that require all their objects to stay encrypted at relaxation with SSE-S3, this replace helps meet their encryption compliance necessities with none further instruments or shopper configuration modifications.
With immediately’s announcement, we now have now made it “zero click” so that you can apply this base degree of encryption on each S3 bucket.
Verify Your Objects Are Encrypted
The change is seen immediately in AWS CloudTrail knowledge occasion logs. You will see the modifications within the S3 part of the AWS Management Console, Amazon S3 Inventory, Amazon S3 Storage Lens, and as an extra header within the AWS CLI and within the AWS SDKs over the subsequent few weeks. We will replace this weblog put up and documentation when the encryption standing is out there in these instruments in all AWS Regions.
To confirm the change is efficient in your buckets immediately, you possibly can configure CloudTrail to log knowledge occasions. By default, trails don’t log knowledge occasions, and there’s an additional price to allow it. Data occasions present the useful resource operations carried out on or inside a useful resource, equivalent to when a consumer uploads a file to an S3 bucket. You can log knowledge occasions for Amazon S3 buckets, AWS Lambda features, Amazon DynamoDB tables, or a mixture of these.
Once enabled, seek for PutObject API for file uploads or InitiateMultipartUpload for multipart uploads. When Amazon S3 mechanically encrypts an object utilizing the default encryption settings, the log contains the next subject because the name-value pair: "SSEApplied":"Default_SSE_S3". Here is an instance of a CloudTrail log (with knowledge occasion logging enabled) after I uploaded a file to one among my buckets utilizing the AWS CLI command aws s3 cp backup.sh s3://private-sst.
Amazon S3 Encryption Options
As I wrote earlier, SSE-S3 is now the brand new base degree of encryption when no different encryption-type is specified. SSE-S3 makes use of Advanced Encryption Standard (AES) encryption with 256-bit keys managed by AWS.
You can select to encrypt your objects utilizing SSE-C or SSE-KMS quite than with SSE-S3, both as “one click” default encryption settings on the bucket, or for particular person objects in PUT requests.
SSE-C lets Amazon S3 carry out the encryption and decryption of your objects whilst you retain management of the keys used to encrypt objects. With SSE-C, you don’t must implement or use a client-side library to carry out the encryption and decryption of objects you retailer in Amazon S3, however you do must handle the keys that you just ship to Amazon S3 to encrypt and decrypt objects.
With SSE-KMS, AWS Key Management Service (AWS KMS) manages your encryption keys. Using AWS KMS to handle your keys supplies a number of further advantages. With AWS KMS, there are separate permissions for the usage of the KMS key, offering an extra layer of management in addition to safety towards unauthorized entry to your objects saved in Amazon S3. AWS KMS supplies an audit path so you possibly can see who used your key to entry which object and when, in addition to view failed makes an attempt to entry knowledge from customers with out permission to decrypt the info.
When utilizing an encryption shopper library, equivalent to the Amazon S3 encryption shopper, you keep management of the keys and full the encryption and decryption of objects client-side utilizing an encryption library of your selection. You encrypt the objects earlier than they’re despatched to Amazon S3 for storage. The Java, .Net, Ruby, PHP, Go, and C++ AWS SDKs assist client-side encryption.
You can comply with the directions on this weblog put up if you wish to retroactively encrypt present objects in your buckets.
Available Now
This change is efficient now, in all AWS Regions, together with on AWS GovCloud (US) and AWS China Regions. There isn’t any further price for default object-level encryption.