Imagine you're building a web application and deploying it on AWS.

Your application stores customer information, database credentials, uploaded documents, and other sensitive data.

Now consider something important:

What happens if someone gains access to the underlying storage? Can they read your data?

This is where encryption becomes essential.

AWS provides several services and mechanisms to protect sensitive information. One of the most important is AWS Key Management Service (AWS KMS) .

In this article, I'll explore how encryption works in AWS, what KMS does, how envelope encryption protects data, and how services such as Amazon S3 and AWS Secrets Manager use encryption in real-world applications.

Figure: Understanding AWS data protection through encryption, key management, and secure application architecture.

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