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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchNo. Amazon S3 encrypts new object uploads at rest by default, but that does not mean requests and responses are protected in transit. To make a general-purpose bucket reject unencrypted HTTP requests, add a bucket policy that denies requests unless they use HTTPS. Check existing objects and test your applications before enforcing the policy.
What S3’s default encryption does—and does not do
Encryption at rest protects object data while it is stored. AWS says S3 encrypts objects before saving them to disks and decrypts them when they are downloaded. This is server-side encryption; it does not, by itself, require a client to connect over HTTPS. AWS: Protecting data with encryption
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Since January 5, 2023, S3 has automatically applied SSE-S3 server-side encryption to new object uploads by default. AWS says this automatic default has no additional cost and no performance impact. AWS: Default encryption FAQ
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S3 also offers SSE-KMS and DSSE-KMS for different key-management controls or dual-layer encryption. These are choices for encryption at rest, not substitutes for requiring encrypted transport. SSE-KMS and DSSE-KMS also involve AWS KMS permissions and request quotas. Review the current configuration and requirements in AWS’s default encryption documentation.
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At rest versus in transit
| Protection | What it covers | How it is controlled |
|---|---|---|
| At rest | Object data stored by S3 | Server-side encryption, such as SSE-S3, SSE-KMS, or DSSE-KMS |
| In transit | Requests and responses moving between a client and S3 | HTTPS/TLS for the connection; a bucket policy can deny requests that do not use secure transport |
AWS accepts HTTP traffic to S3 in general. Its documentation recommends HTTPS/TLS to protect data as it travels between clients and S3. A bucket’s at-rest encryption setting should therefore not be treated as evidence that HTTP requests are blocked. AWS: Protecting data in transit with encryption
How to require HTTPS for a bucket
Use a bucket policy with an explicit Deny for requests where the aws:SecureTransport condition is false. The resource scope should include both the bucket ARN and its objects. Adapt AWS’s documented policy example to your bucket and review it before deployment:
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{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "DenyInsecureTransport",
"Effect": "Deny",
"Principal": "*",
"Action": "s3:*",
"Resource": [
"arn:aws:s3:::BUCKET_NAME",
"arn:aws:s3:::BUCKET_NAME/*"
],
"Condition": {
"Bool": {
"aws:SecureTransport": "false"
}
}
}
]
}Replace BUCKET_NAME with the bucket’s actual name. An explicit deny blocks insecure requests even if another policy would otherwise allow access. AWS provides the policy syntax and transport guidance in Protecting data in transit with encryption.
Require a minimum TLS version if needed
HTTPS-only enforcement and minimum protocol enforcement are distinct requirements. If your security standard specifies an approved minimum TLS version, use the documented s3:TlsVersion condition in a policy designed for that requirement. Set the version to your organization’s approved minimum rather than assuming one universal threshold. See AWS’s transport policy examples.
Test before enforcing the deny
Because the policy rejects non-TLS requests, first confirm that every intended access path works over HTTPS. Test application clients and SDKs, presigned URLs, scheduled jobs, and third-party integrations. Also review public and cross-account access patterns so the policy does not unintentionally break required behavior. AWS recommends allowing only encrypted HTTPS/TLS connections with aws:SecureTransport in S3 bucket policies. AWS: Security best practices for Amazon S3
For ongoing visibility, AWS recommends monitoring HTTP access attempts using CloudWatch alarms and CloudTrail TLS details. That helps identify attempted insecure access rather than relying only on the policy’s blocking effect. AWS: Security best practices for Amazon S3
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check existing objects and access controls separately
Changing a bucket’s default encryption configuration does not retroactively change encryption on objects that already exist. Review the objects themselves and AWS’s current remediation guidance for your workload before deciding whether existing data needs separate action. AWS: Configuring default encryption
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Encryption is only one part of S3 security. Bucket policies, identity permissions, and other access controls determine who can access data; neither at-rest encryption nor TLS alone prevents an authorized-but-overprivileged identity from reading it. For broader security guidance, see AWS Prescriptive Guidance: Amazon Simple Storage Service.
This guidance is for general-purpose S3 buckets. Directory buckets and specialized features may have separate behavior; check their dedicated AWS documentation before applying a general-purpose bucket policy.
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