Cloud Security Alliance Updated CCSK Exam Questions and Answers by tahlia

The correct answer isB. Customers retain control over their encryption keys.

Usingcustomer-managed encryption keys (CMEK)with a cloudKey Management Service (KMS)allows the customer toretain full control over the encryption keysused to encrypt their data. This is crucial in maintaining data sovereignty, privacy, and compliance with regulatory requirements.

Key Benefits of Customer-Managed Encryption Keys:

Key Ownership and Control:Unlike cloud provider-managed keys, CMEK ensures that the customer has full authority over the key's lifecycle, including creation, rotation, and deletion.

Enhanced Security:Customers can enforce strict access controls and audit who accesses the keys.

Compliance:Many regulations (like GDPR or HIPAA) mandate that data owners maintain control over encryption keys.

Data Privacy:Even though the data is stored on the cloud, the provider cannot access unencrypted data without the customer's permission.

Flexibility:Customers can choose when to revoke or rotate keys, which directly impacts data availability and access.

Why Other Options Are Incorrect:

A. Bypass the need for encryption:CMEK does not eliminate the need for encryption; it strengthens it by giving customers direct control.

C. Share encryption keys more easily:Sharing encryption keys can increase security risks, and CMEK is designed to restrict, not ease, key sharing.

D. Reduces computational load on the cloud service provider:CMEK does not impact the computational load. It focuses on key management and control rather than reducing processing overhead.

Real-World Example:

InAWS KMS, using CMEK allows customers to bring their own keys (BYOK) and manage them directly through AWS Key Management Service. Similar practices exist inGoogle Cloud KMSandAzure Key Vault, where customers can generate and control their own encryption keys.

Practical Use Case:

A healthcare provider using a cloud service to store patient records may use CMEK to ensure that sensitive data is encrypted under keys they control, ensuring compliance with regulations likeHIPAA.

The correct answer isD. Cloud systems automatically monitor resource usage and provide billing based on actual consumption.

Measured Service is one of theessential characteristics of cloud computingas defined by theNIST (National Institute of Standards and Technology). It implies that cloud systems automatically control and optimize resource usage by leveraging ametering capability. This capability tracks and reports resource consumption (such as CPU, storage, or bandwidth), which is used for billing, monitoring, and planning.

Key Characteristics:

Automatic Monitoring:Cloud platforms continuously track resource usage without manual intervention.

Billing Based on Usage:Customers are billed based on the actual consumption of resources (pay-as-you-go model).

Transparency:Users can view detailed usage reports to understand their resource utilization and associated costs.

Resource Optimization:Providers use these metrics to optimize resource allocation and improve efficiency.

Why Other Options Are Incorrect:

A. Fixed immutable set of measured services:This contradicts the concept of elasticity and resource pooling in cloud computing.

B. Elastic resources:While elasticity is a cloud characteristic, it does not directly define measured service.

C. Manual reporting:Measured service is aboutautomated, real-time monitoring and billing, not manual data gathering.

Real-World Example:

In AWS, services likeAmazon CloudWatchautomatically collect and provide usage metrics, and the AWS Billing Console shows the cost associated with each resource.

Infrastructure as Code (IaC) helps maintain consistency in security configurations through automation, reducing the likelihood of misconfigurations. Reference: [Security Guidance v5, Domain 7 - Infrastructure & Networking]