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What is Key pairs in AWS?

 
Key pairs consist of a public and private key, where you use the private key to create a digital signature, and then AWS uses the corresponding public key to validate the signature. Key pairs are used only for Amazon EC2 and Amazon CloudFront.

For Amazon EC2, you use key pairs to access Amazon EC2 instances like when you use SSH to log in to a Linux instance. For more information, see Connecting to Amazon EC2 Instances in the Amazon Elastic Compute Cloud Developer Guide.
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