How to secure access to your S3 bucket?

S3 bucket can be secured in 2 ways:

• ACL (Access Control List) is used to manage the access of resources to buckets and objects. An object of each bucket is associated with ACL. It defines which AWS accounts have granted access and the type of access. When a user sends the request for a resource, then its corresponding ACL will be checked to verify whether the user has granted access to the resource or not. When you create a bucket, then Amazon S3 creates a default ACL which provides full control over the AWS resources.
• Bucket policies are only applied to S3 bucket. Bucket policies define what actions are allowed or denied. Bucket policies are attached to the bucket not to an S3 object but the permissions define in the bucket policy are applied to all the objects in S3 bucket.

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