Security in Amazon S3
Important
Starting in April 2026, AWS will disable server-side encryption with customer-provided keys (SSE-C) for all new buckets. In addition, SSE-C encryption will be disabled for all existing buckets in AWS accounts that do not have any SSE-C encrypted data. With these changes, the few applications that need SSE-C encryption must deliberately enable the use SSE-C via the PutBucketEncryption API after creating the bucket. In these cases, you might need to update automation scripts, CloudFormation templates, or other infrastructure configuration tools to configure these settings. For more information, see the AWS Storage Blog post
Cloud security at AWS is the highest priority. As an AWS customer, you benefit from a data center and network architecture that are built to meet the requirements of the most security-sensitive organizations.
Security is a shared responsibility between AWS and you. The shared
responsibility model
Security of the cloud
AWS is responsible for
protecting the infrastructure that runs AWS services in the AWS Cloud. AWS also
provides you with services that you can use securely. The effectiveness of our security is
regularly tested and verified by third-party auditors as part of the
AWS compliance programs
Security in the cloud
Your responsibility is determined by the AWS service that you use. You are also responsible for other factors including the sensitivity of your data, your organization’s requirements, and applicable laws and regulations. For Amazon S3, your responsibility includes the following areas:
Managing your data, including object ownership and encryption.
Classifying your assets.
Managing access to your data using IAM roles and other service configurations to apply the appropriate permissions.
Enabling detective controls such as AWS CloudTrail or Amazon GuardDuty for Amazon S3.
This documentation will help you understand how to apply the shared responsibility model when using Amazon S3. The following topics show you how to configure Amazon S3 to meet your security and compliance objectives. You'll also learn how to use other AWS services that can help you monitor and secure your Amazon S3 resources.
Note
For more information about using the Amazon S3 Express One Zone storage class with directory buckets, see S3 Express One Zone and Working with directory buckets.
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