The AWS Security Token Service (STS) is a web service that enables you to request temporary, limited-privilege credentials for AWS Identity and Access Management (IAM) users or for users that you authenticate (federated users). The token can then be used to grant access to the objects in S3. You can then provides access to the objects based on the key values generated via the user id. http://docs.aws.amazon.com/STS/latest/APIReference/Welcome.html
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