AWS Key Management Service (KMS) Mastery Hub: The Industry F

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Elite Practice Intelligence

Q1Domain Verified

A financial services company migrating sensitive customer data to AWS needs to ensure that the encryption keys used for data at rest are managed with the highest level of security and compliance. They are considering using AWS KMS to manage these keys. What KMS key policy configuration would best satisfy stringent regulatory requirements for key access auditing and the principle of least privilege?

A policy that explicitly grants `kms:Encrypt`, `kms:Decrypt`, and `kms:ReEncrypt*` actions to specific IAM roles associated with the application services, and also grants `kms:ListKeys` and `kms:DescribeKey` to an auditing IAM group.

A broad policy granting `kms:Encrypt` and `kms:Decrypt` actions to all IAM users within the account, with no explicit deniability.

A policy that grants `kms:GenerateDataKey` and `kms:Decrypt` to a wildcard principal (`*`) for all KMS keys in the account, as this simplifies key management.

A policy that exclusively grants `kms:Encrypt` to all IAM users and roles, requiring applications to manage their own decryption keys separately.

Q2Domain Verified

A multinational corporation is implementing a data sovereignty strategy, requiring that encryption keys used for data stored in AWS regions outside their primary country of operation be managed and controlled by entities within that specific region. How can AWS KMS be utilized to enforce this requirement effectively, considering both regional isolation and compliance needs?

Create a single KMS key in the primary region and replicate it to all other regions where data is stored, relying on IAM policies for regional access control.

Encrypt all data in the primary region and then transfer the encrypted data to other regions, assuming the encryption itself provides regional isolation.

Utilize AWS CloudHSM for all keys and configure it to be accessible globally, with access restricted by network ACLs.

Create separate KMS Customer Master Keys (CMKs) within each target region where sensitive data resides and configure KMS key policies and IAM policies to restrict key usage to entities operating within that specific region.

Q3Domain Verified

An organization is developing an application that will store user-generated content, which includes sensitive personal information. They need to implement a robust encryption strategy where individual pieces of content can be encrypted with unique data keys, and these data keys themselves are protected by a KMS Customer Master Key (CMK). The application needs to perform these operations at scale. Which KMS API call is the most appropriate and efficient for generating a data key that can be used for encrypting a significant volume of data, while also providing the encrypted data key for secure storage?

`GenerateDataKeyWithoutPlaintext`

`Encrypt`

`Decrypt`

`GenerateDataKey`

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