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Question 662 - SAA-C03 discussion

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A company needs to provide customers with secure access to its data. The company processes customer data and stores the results in an Amazon S3 bucket.

All the data is subject to strong regulations and security requirements. The data must be encrypted at rest. Each customer must be able to access only their data from their AWS account. Company employees must not be able to access the data.

Which solution will meet these requirements?

A.
Provision an AWS Certificate Manager (ACM) certificate for each customer. Encrypt the data client-side. In the private certificate policy, deny access to the certificate for all principals except an 1AM role that the customer provides.
Answers
A.
Provision an AWS Certificate Manager (ACM) certificate for each customer. Encrypt the data client-side. In the private certificate policy, deny access to the certificate for all principals except an 1AM role that the customer provides.
B.
Provision a separate AWS Key Management Service (AWS KMS) key for each customer. Encrypt the data server-side. In the S3 bucket policy, deny decryption of data for all principals except an 1AM role that the customer provides.
Answers
B.
Provision a separate AWS Key Management Service (AWS KMS) key for each customer. Encrypt the data server-side. In the S3 bucket policy, deny decryption of data for all principals except an 1AM role that the customer provides.
C.
Provision a separate AWS Key Management Service (AWS KMS) key for each customer. Encrypt the data server-side. In each KMS key policy, deny decryption of data for all principals except an 1AM role that the customer provides.
Answers
C.
Provision a separate AWS Key Management Service (AWS KMS) key for each customer. Encrypt the data server-side. In each KMS key policy, deny decryption of data for all principals except an 1AM role that the customer provides.
D.
Provision an AWS Certificate Manager (ACM) certificate for each customer. Encrypt the data client-side. In the public certificate policy, deny access to the certificate for all principals except an 1AM role that the customer provides.
Answers
D.
Provision an AWS Certificate Manager (ACM) certificate for each customer. Encrypt the data client-side. In the public certificate policy, deny access to the certificate for all principals except an 1AM role that the customer provides.
Suggested answer: C

Explanation:

The correct solution is to provision a separate AWS KMS key for each customer and encrypt the data server-side. This way, the company can use the S3 encryption feature to protect the data at rest and delegate the control of the encryption keys to the customers. The customers can then use their own IAM roles to access and decrypt their data. The company employees will not be able to access the data because they are not authorized by the KMS key policies. The other options are incorrect because:

Option A and D are using ACM certificates to encrypt the data client-side. This is not a recommended practice for S3 encryption because it adds complexity and overhead to the encryption process. Moreover, the company will have to manage the certificates and their policies for each customer, which is not scalable and secure.

Option B is using a separate KMS key for each customer, but it is using the S3 bucket policy to control the decryption access. This is not a secure solution because the bucket policy applies to the entire bucket, not to individual objects. Therefore, the customers will be able to access and decrypt each other's data if they have the permission to list the bucket contents. The bucket policy also overrides the KMS key policy, which means the company employees can access the data if they have the permission to use the KMS key.

S3 encryption

KMS key policies

ACM certificates

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asked 16/09/2024
Larry Warren
31 questions
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