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AWS: Security Best Practices on AWS by Albert Anthony

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Signing AWS API Requests

API requests sent to AWS should include a digital signature that contains information about the requestor's identity. This identity is verified by AWS for all API requests. This process is known as signing API requests. For all API requests generated through AWS tools, such as AWS SDKs and AWS Command Line Interface, the digital signature is included for you, however, for all API requests that you create manually, you have to include this digital signature yourself.

In other words, you need to sign your HTTP requests when you create them. You need to do this if you are writing a code in a programming language that does not have an AWS SDK. Furthermore, if you need to control what is sent along with an API request, you can ...

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