Topic: AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 696

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 IAM 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 IAM 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 IAM 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 IAM role that the customer provides.

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Re: AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 696

Actually I think neither B or C is correctly worded. If talking about key policy, should be "Modify the key's policy to grant the IAM user permissions for the kms:GenerateDataKey and kms:Decrypt actions at minimum."
If talking about bucket policy, should be "Deny GetObjects of particular customer without condition kms key equals 1234abcd...."

Re: AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 696

Encryption at rest --> KMS
Each customer must be able to access only their data --> KMS Key Policies

Re: AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 696

B.
Here's why this option is the best fit:
Server-Side Encryption: Encrypting data server-side with KMS ensures encryption happens transparently within AWS, eliminating the need for complex client-side management and potential security risks associated with user-managed keys.
Customer-Specific Keys: Utilizing separate KMS keys for each customer provides granular access control and encryption isolation. Each customer can only decrypt their data using their specific KMS key.
S3 Bucket Policy: By denying decryption permissions for all principals except the dedicated customer IAM role in the S3 bucket policy, unauthorized access, even from company employees, is prevented. This aligns with the requirement of customer-specific data access.

Re: AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 696

Option C
From Chapt
Option A is incorrect because using ACM certificates is typically for establishing secure communication over HTTPS and doesn't directly relate to encrypting data at rest in S3.

Option B is incorrect because while it suggests using AWS KMS keys for encryption, it mentions using S3 bucket policies for access control, which would not be appropriate for controlling decryption permissions.

Option D is incorrect because it suggests using ACM certificates for client-side encryption, which is not typically used for encrypting data at rest in S3, and the approach described would not effectively control access to the encrypted data.

Re: AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 696

Correct answer should be C